private static string GetRemoteHostname(AssociationParameters association)
{
string remoteHostname = null;
try
{
if (association.RemoteEndPoint != null)
{
try
{
IPHostEntry entry = Dns.GetHostEntry(association.RemoteEndPoint.Address);
remoteHostname = entry.HostName;
}
catch
{
remoteHostname = association.RemoteEndPoint.Address.ToString();
}
}
}
catch (Exception e)
{
remoteHostname = null;
Platform.Log(LogLevel.Warn, e, "Unable to resolve remote host name for auditing.");
}
return remoteHostname;
}
protected override DicomPresContextResult OnVerifyAssociation(AssociationParameters association, byte pcid)
{
if (!Device.AllowMPPS)
{
return DicomPresContextResult.RejectUser;
}
return DicomPresContextResult.Accept;
}
private DicomClient(AssociationParameters assoc, IDicomClientHandler handler)
{
_remoteEndPoint = assoc.RemoteEndPoint;
_socket = null;
_network = null;
_closedEvent = null;
_timeout = 10;
_handler = handler;
_assoc = assoc;
}
public static bool VerifyAssociation(IDicomServerContext context, AssociationParameters assoParams,
out DicomRejectResult result, out DicomRejectReason reason)
{
string calledAET = (assoParams.CalledAE ?? "").Trim();
string callingAET = (assoParams.CallingAE ?? "").Trim();
result = DicomRejectResult.Permanent;
reason = DicomRejectReason.NoReasonGiven;
return true;
}
protected override DicomPresContextResult OnVerifyAssociation(AssociationParameters association, byte pcid)
{
// if (!Device.AllowWorkList)
// {
// return DicomPresContextResult.RejectUser;
// }
return DicomPresContextResult.Accept;
}
protected override void OnReceiveAssociateAccept(AssociationParameters association)
{
try
{
_handler.OnReceiveAssociateAccept(this, association as ClientAssociationParameters);
}
catch (Exception e)
{
OnUserException(e, "Unexpected exception on OnReceiveAssociateAccept");
}
}
/// <summary>
/// Connection to a remote DICOM application via TLS.
/// </summary>
/// <param name="assoc"></param>
/// <param name="handler"></param>
/// <returns></returns>
public static DicomClient ConnectTLS(AssociationParameters assoc, IDicomClientHandler handler)
{
DicomClient client = new DicomClient(assoc, handler);
client.ConnectTLS();
return client;
}
/// <summary>
/// Event handler called when an association has been aborted.
/// </summary>
/// <param name="assoc">The aborted association</param>
/// <param name="reason">The abort reason</param>
protected void OnAssociationAborted(AssociationParameters assoc, DicomAbortReason reason)
{
if (_assocStats == null)
return;
// update the association statistics
_assocStats.IncomingBytes = assoc.TotalBytesRead;
_assocStats.OutgoingBytes = assoc.TotalBytesSent;
// signal stop recording.. the statistic object will fill out whatever
// it needs at this point based on what we have set
_assocStats.End();
}
/// <summary>
/// Method used to send an association request.
/// </summary>
/// <param name="associate">The parameters used in the association request.</param>
public void SendAssociateRequest(AssociationParameters associate)
{
_assoc = associate;
var pdu = new AAssociateRQ(_assoc);
State = DicomAssociationState.Sta5_AwaitingAAssociationACOrReject;
EnqueuePdu(pdu.Write());
}
private static bool NegotiateAssociation(AssociationParameters cp, ServerAssociationParameters sp)
{
foreach (DicomPresContext clientContext in cp.GetPresentationContexts())
{
TransferSyntax selectedSyntax = null;
foreach (DicomPresContext serverContext in sp.GetPresentationContexts())
{
if (clientContext.AbstractSyntax.Uid.Equals(serverContext.AbstractSyntax.Uid))
{
foreach (TransferSyntax ts in serverContext.GetTransfers())
{
if (clientContext.HasTransfer(ts))
{
selectedSyntax = ts;
break;
}
}
}
if (selectedSyntax != null)
break;
}
if (selectedSyntax != null)
{
clientContext.ClearTransfers();
clientContext.AddTransfer(selectedSyntax);
clientContext.SetResult(DicomPresContextResult.Accept);
}
else
{
// No contexts accepted, set if abstract or transfer syntax reject
clientContext.SetResult(0 == sp.FindAbstractSyntax(clientContext.AbstractSyntax)
? DicomPresContextResult.RejectAbstractSyntaxNotSupported
: DicomPresContextResult.RejectTransferSyntaxesNotSupported);
}
}
bool anyValidContexts = false;
foreach (DicomPresContext clientContext in cp.GetPresentationContexts())
{
if (clientContext.Result == DicomPresContextResult.Accept)
{
anyValidContexts = true;
break;
}
}
if (anyValidContexts == false)
{
return false;
}
return true;
}
public static Device LookupDevice(ServerPartition partition, AssociationParameters association,
out bool isNew)
{
isNew = false;
Device device = null;
using (var ctx = new PacsContext())
{
var part = (from p in ctx.ServerPartitions select p).FirstOrDefault();
if (part != null)
{
device = part.Devices.FirstOrDefault(d => d.AeTitle.Equals(association.CallingAE));
}
if (device == null)
{
if (!partition.AcceptAnyDevice)
{
return null;
}
if (partition.AutoInsertDevice)
{
device = new Device
{
AeTitle = association.CallingAE,
Enabled = true,
Description = string.Format("AE: {0}", association.CallingAE),
//TODO
Port = 104,
AllowQuery = true,
AllowRetrieve = true,
AllowStorage = true,
ServerPartitionPK = part.Id,
LastAccessTime = DateTime.Now
};
ctx.Devices.Add(device);
ctx.SaveChanges();
isNew = true;
}
}
if (device != null)
{
if (device.Dhcp && !association.RemoteEndPoint.Address.ToString().Equals(device.Hostname))
{
device.Hostname = association.RemoteEndPoint.Address.ToString();
device.LastAccessTime = DateTime.Now;
ctx.SaveChanges();
}
else if (!isNew)
{
device.LastAccessTime = DateTime.Now;
ctx.SaveChanges();
}
}
}
return device;
}
protected AssociationParameters(AssociationParameters parameters)
{
DisableNagle = NetworkSettings.Default.DisableNagle;
RemoteMaxOperationsPerformed = 1;
RemoteMaxOperationsInvoked = 1;
TotalDimseReceived = 0;
TotalBytesSent = 0;
TotalBytesRead = 0;
ApplicationContextName = parameters.ApplicationContextName;
CalledAE = parameters.CalledAE;
CallingAE = parameters.CallingAE;
ImplementationClass = parameters.ImplementationClass;
ImplementationVersion = parameters.ImplementationVersion;
LocalEndPoint = parameters.LocalEndPoint;
LocalMaximumPduLength = parameters.LocalMaximumPduLength;
RemoteMaximumPduLength = parameters.RemoteMaximumPduLength;
ReadTimeout = parameters.ReadTimeout;
ReceiveBufferSize = parameters.ReceiveBufferSize;
RemoteEndPoint = parameters.RemoteEndPoint;
SendBufferSize = parameters.SendBufferSize;
WriteTimeout = parameters.WriteTimeout;
ConnectTimeout = parameters.ConnectTimeout;
foreach (byte id in parameters._presContexts.Keys)
{
AddPresentationContext(id,parameters._presContexts[id].AbstractSyntax);
foreach (TransferSyntax ts in parameters._presContexts[id].GetTransfers())
{
AddTransferSyntax(id,ts);
}
SetRoleSelect(id, parameters._presContexts[id].GetRoleSelect());
}
}
/// <summary>
/// Event handlers called when association has been established.
/// </summary>
/// <param name="assoc">The association</param>
protected void OnAssociationEstablished(AssociationParameters assoc)
{
if (_assocStats == null)
_assocStats = new TransmissionStatistics(string.Format("DICOM association from {0} [{1}:{2}] to {3}",
assoc.CallingAE,
assoc.RemoteEndPoint.Address,
assoc.RemoteEndPoint.Port,
assoc.CalledAE));
// start recording
_assocStats.Begin();
}
/// <summary>
/// Event handler called while a DICOM message has been sent.
/// </summary>
/// <param name="assoc">The association</param>
/// <param name="dcmMsg">The request DICOM message sent</param>
private void OnDicomMessageSent(
AssociationParameters assoc,
DicomMessage dcmMsg)
{
if (_assocStats == null)
return;
// update the association stats
_assocStats.IncomingBytes = assoc.TotalBytesRead;
_assocStats.OutgoingBytes = assoc.TotalBytesSent;
_assocStats.OutgoingMessages++;
}
private bool ProcessRawPDU(RawPDU raw)
{
try
{
switch (raw.Type)
{
case 0x01:
{
_assoc = new ServerAssociationParameters();
var pdu = new AAssociateRQ(_assoc);
pdu.Read(raw);
State = DicomAssociationState.Sta3_AwaitingLocalAAssociationResponsePrimative;
OnReceiveAssociateRequest(_assoc as ServerAssociationParameters);
if (State != DicomAssociationState.Sta13_AwaitingTransportConnectionClose &&
State != DicomAssociationState.Sta6_AssociationEstablished)
{
Platform.Log(LogLevel.Error, "Association incorrectly not accepted or rejected, aborting.");
return false;
}
//if derived class call SendAssociateAccept, it has fired this event
//if (AssociationEstablished != null)
// AssociationEstablished(_assoc);
return true;
}
case 0x02:
{
var pdu = new AAssociateAC(_assoc);
pdu.Read(raw);
State = DicomAssociationState.Sta6_AssociationEstablished;
OnReceiveAssociateAccept(_assoc);
if (AssociationEstablished != null)
AssociationEstablished(_assoc);
return true;
}
case 0x03:
{
var pdu = new AAssociateRJ();
pdu.Read(raw);
State = DicomAssociationState.Sta13_AwaitingTransportConnectionClose;
if (AssociationRejected != null)
AssociationRejected(pdu.Source, pdu.Reason);
OnReceiveAssociateReject(pdu.Result, pdu.Source, pdu.Reason);
return true;
}
case 0x04:
{
var pdu = new PDataTF();
pdu.Read(raw);
return ProcessPDataTF(pdu);
}
case 0x05:
{
var pdu = new AReleaseRQ();
pdu.Read(raw);
State = DicomAssociationState.Sta8_AwaitingAReleaseRPLocalUser;
OnReceiveReleaseRequest();
return true;
}
case 0x06:
{
var pdu = new AReleaseRP();
pdu.Read(raw);
State = DicomAssociationState.Sta13_AwaitingTransportConnectionClose;
if (AssociationReleased != null)
AssociationReleased(_assoc);
OnReceiveReleaseResponse();
return true;
}
case 0x07:
{
var pdu = new AAbort();
pdu.Read(raw);
State = DicomAssociationState.Sta1_Idle;
if (AssociationAborted != null)
AssociationAborted(_assoc, pdu.Reason);
OnReceiveAbort(pdu.Source, pdu.Reason);
return true;
}
case 0xFF:
{
Platform.Log(LogLevel.Error, "Unexpected PDU type: 0xFF. Potential parsing error.");
return false;
}
default:
throw new DicomNetworkException("Unknown PDU type");
}
}
catch (Exception e)
{
OnNetworkError(e, true);
if (NetworkError != null)
NetworkError(e);
Platform.Log(LogLevel.Error, e, "Unexpected exception when processing PDU.");
return false;
}
}
public AAssociateAC(AssociationParameters assoc)
{
_assoc = assoc;
}
protected virtual void OnReceiveAssociateAccept(AssociationParameters association)
{
}
protected override DicomPresContextResult OnVerifyAssociation(AssociationParameters association,
byte pcid)
{
return DicomPresContextResult.Accept;
}
/// <summary>
/// Method to send an association accept.
/// </summary>
/// <param name="associate">The parameters to use for the association accept.</param>
public void SendAssociateAccept(AssociationParameters associate)
{
if (State != DicomAssociationState.Sta3_AwaitingLocalAAssociationResponsePrimative)
{
Platform.Log(LogLevel.Error, "Error attempting to send association accept at invalid time in association.");
SendAssociateAbort(DicomAbortSource.ServiceProvider, DicomAbortReason.NotSpecified);
throw new DicomNetworkException(
"Attempting to send association accept at invalid time in association, aborting");
}
var pdu = new AAssociateAC(_assoc);
EnqueuePdu(pdu.Write());
State = DicomAssociationState.Sta6_AssociationEstablished;
if (AssociationEstablished != null)
AssociationEstablished(_assoc);
}
/// <summary>
/// Event handler called when an association has been released.
/// </summary>
/// <param name="assoc">The association</param>
protected void OnAssociationReleased(AssociationParameters assoc)
{
if (_assocStats == null)
return;
// update the association statistics
_assocStats.IncomingBytes = assoc.TotalBytesRead;
_assocStats.OutgoingBytes = assoc.TotalBytesSent;
// signal stop recording.. the statistic object will fill out whatever
// it needs at this point based on what we have set
_assocStats.End();
if (_logInformation)
StatisticsLogger.Log(LogLevel.Info, _assocStats);
}
