/// <summary>
/// Creates shared memory object.
/// </summary>
public void LowLevel_CreateSharedMemory()
{
if (WindowsAPI.FailureReason != null)
{
throw OperationException.WrapException(WindowsAPI.FailureReason);
}
IParameterProvider parameters = this.ITransportContext.IParameterProvider;
string fileMappingName = GenuineSharedMemoryChannel.ConstructSharedObjectName(
this.ShareName, parameters);
this._mapHandle = WindowsAPI.CreateFileMapping((IntPtr)(int)-1, WindowsAPI.AttributesWithNullDACL, WindowsAPI.PAGE_READWRITE, 0, (uint)this._shareSize, fileMappingName);
if (this._mapHandle == IntPtr.Zero)
{
throw GenuineExceptions.Get_Windows_CanNotCreateOrOpenSharedMemory(Marshal.GetLastWin32Error());
}
this._pointer = WindowsAPI.MapViewOfFile(this._mapHandle, WindowsAPI.SECTION_MAP_READ | WindowsAPI.SECTION_MAP_WRITE, 0, 0, 0);
if (this._pointer == IntPtr.Zero)
{
int lastWinError = Marshal.GetLastWin32Error();
WindowsAPI.CloseHandle(this._mapHandle);
throw GenuineExceptions.Get_Windows_SharedMemoryError(lastWinError);
}
}
/// <summary>
/// Opens the handle of an existent share.
/// </summary>
public void OpenSharedMemory()
{
IParameterProvider parameters = this.ITransportContext.IParameterProvider;
string fileMappingName = GenuineSharedMemoryChannel.ConstructSharedObjectName(
this.ShareName, parameters);
this._mapHandle = WindowsAPI.OpenFileMapping(WindowsAPI.FILE_MAP_ALL_ACCESS, 0, fileMappingName);
if (this._mapHandle == IntPtr.Zero)
{
throw GenuineExceptions.Get_Windows_CanNotCreateOrOpenSharedMemory(Marshal.GetLastWin32Error());
}
this._pointer = WindowsAPI.MapViewOfFile(this._mapHandle, WindowsAPI.SECTION_MAP_READ | WindowsAPI.SECTION_MAP_WRITE, 0, 0, 0);
if (this._pointer == IntPtr.Zero)
{
int lastWinError = Marshal.GetLastWin32Error();
WindowsAPI.CloseHandle(this._mapHandle);
throw GenuineExceptions.Get_Windows_SharedMemoryError(lastWinError);
}
}
/// <summary>
/// Accepts incoming connections.
/// </summary>
public void AcceptConnections()
{
BinaryLogWriter binaryLogWriter = this.ITransportContext.BinaryLogWriter;
byte protocolVersion;
GenuineConnectionType genuineConnectionType;
try
{
IParameterProvider parameters = this.ITransportContext.IParameterProvider;
string mutexName = GenuineSharedMemoryChannel.ConstructSharedObjectName(
"MUTEX" + this.ShareName, parameters);
string clientConnected = GenuineSharedMemoryChannel.ConstructSharedObjectName(
"CC" + this.ShareName, parameters);
string clientAccepted = GenuineSharedMemoryChannel.ConstructSharedObjectName(
"CA" + this.ShareName, parameters);
this._mutex = WindowsAPI.CreateMutex(mutexName);
this._clientConnectedEvent = NamedEvent.CreateNamedEvent(clientConnected, false, false);
this._clientAcceptedEvent = NamedEvent.CreateNamedEvent(clientAccepted, false, true);
WaitHandle[] handles = new WaitHandle[2] {
this._clientConnectedEvent.ManualResetEvent, this.StopListening
};
for ( ; ;)
{
try
{
// listen
WaitHandle.WaitAny(handles);
// if shutting down
if (this.StopListening.WaitOne(0, false))
{
return;
}
// set timeout
int timeout = GenuineUtility.GetTimeout((TimeSpan)this.ITransportContext.IParameterProvider[GenuineParameter.ConnectTimeout]);
// client is connecting
using (Stream headerStream = this.SharedMemoryConnection.LowLevel_ReadSync(timeout))
{
BinaryReader binaryReader = new BinaryReader(headerStream);
string connectionId;
MessageCoder.DeserializeConnectionHeader(binaryReader, out protocolVersion, out genuineConnectionType, out connectionId);
string shareName = binaryReader.ReadString();
this._clientAcceptedEvent.ManualResetEvent.Set();
// LOG:
if (binaryLogWriter != null && binaryLogWriter[LogCategory.AcceptingConnection] > 0)
{
binaryLogWriter.WriteEvent(LogCategory.AcceptingConnection, "SMAcceptConnectionClosure.AcceptConnections",
LogMessageType.ConnectionAccepting, null, null, null, null,
GenuineUtility.CurrentThreadId, Thread.CurrentThread.Name,
null, null, -1, 0, 0, 0, null, null, null, null,
"An inbound Shared Memory connection is being accepted.");
}
AcceptConnectionInformation acceptConnectionInformation = new AcceptConnectionInformation();
acceptConnectionInformation.ShareName = shareName;
acceptConnectionInformation.ProtocolVersion = protocolVersion;
GenuineThreadPool.QueueUserWorkItem(new WaitCallback(this.AcceptConnection), acceptConnectionInformation, true);
}
}
catch (Exception ex)
{
// LOG:
if (binaryLogWriter != null && binaryLogWriter[LogCategory.AcceptingConnection] > 0)
{
binaryLogWriter.WriteEvent(LogCategory.AcceptingConnection, "SMAcceptConnectionClosure.AcceptConnections",
LogMessageType.ConnectionAccepting, ex, null, null, null,
GenuineUtility.CurrentThreadId, Thread.CurrentThread.Name,
null, null, -1, 0, 0, 0, null, null, null, null,
"Can't accept a connection.");
}
}
}
}
catch (Exception ex)
{
// LOG:
if (binaryLogWriter != null && binaryLogWriter[LogCategory.AcceptingConnection] > 0)
{
binaryLogWriter.WriteEvent(LogCategory.AcceptingConnection, "SMAcceptConnectionClosure.AcceptConnections",
LogMessageType.CriticalError, ex, null, null, null,
GenuineUtility.CurrentThreadId, Thread.CurrentThread.Name,
null, null, -1, 0, 0, 0, null, null, null, null,
"Critical listener failure. No connections will be accepted.");
}
this.SharedMemoryConnectionManager.ITransportContext.IGenuineEventProvider.Fire(new GenuineEventArgs(GenuineEventType.GeneralListenerFailure, ex, null, this.ShareName));
}
finally
{
this.SharedMemoryConnection.ReleaseUnmanagedResources();
if (this._mutex != null)
{
this._mutex.Close();
}
}
}
/// <summary>
/// Constructs an instance of the SharedMemoryConnection class.
/// </summary>
/// <param name="iTransportContext">The transport context.</param>
/// <param name="name">The name of the shared chunk.</param>
/// <param name="isServer">The role.</param>
/// <param name="setCloseStatusOnExit">Indicates whether it is necessary to set the "closed" status on exit.</param>
internal SharedMemoryConnection(ITransportContext iTransportContext, string name, bool isServer, bool setCloseStatusOnExit)
{
this.ITransportContext = iTransportContext;
this.ShareName = "GenuineChannels_GShMem_" + name;
this.IsServer = isServer;
this._setCloseStatusOnExit = setCloseStatusOnExit;
this._shareSize = (int)iTransportContext.IParameterProvider[GenuineParameter.SMShareSize];
this._pingTimeOut = GenuineUtility.ConvertToMilliseconds(iTransportContext.IParameterProvider[GenuineParameter.PersistentConnectionSendPingAfterInactivity]);
this._closeAfterInactivity = GenuineUtility.ConvertToMilliseconds(iTransportContext.IParameterProvider[GenuineParameter.ClosePersistentConnectionAfterInactivity]);
string localSideName = (isServer ? "Server" : "Client");
string remoteSideName = (isServer ? "Client" : "Server");
IParameterProvider parameters = this.ITransportContext.IParameterProvider;
// construct shared object names for the local side
string readCompletedEventName = GenuineSharedMemoryChannel.ConstructSharedObjectName(
this.ShareName + localSideName + "ReadCompleted", parameters);
string writeCompletedEventName = GenuineSharedMemoryChannel.ConstructSharedObjectName(
this.ShareName + localSideName + "WriteCompleted", parameters);
// construct shared object names for the remote side
string remoteReadCompletedEventName = GenuineSharedMemoryChannel.ConstructSharedObjectName(
this.ShareName + remoteSideName + "ReadCompleted", parameters);
string remoteWriteCompletedEventName = GenuineSharedMemoryChannel.ConstructSharedObjectName(
this.ShareName + remoteSideName + "WriteCompleted", parameters);
if (isServer)
{
if (this._shareSize < MIN_SHARE_SIZE || this._shareSize > MAX_SHARE_SIZE)
{
throw GenuineExceptions.Get_Channel_InvalidParameter("SMShareSize");
}
this.LowLevel_CreateSharedMemory();
this._closed = 0;
this._writtenShareSize = this._shareSize;
this._receiveOffset = 5;
this._sendOffset = (this._shareSize - 5) / 2;
this._receiveSpaceSize = this._sendOffset - 5 - 8;
this._sendSpaceSize = this._shareSize - this._sendOffset - 8;
this._namedEventReadCompleted = NamedEvent.CreateNamedEvent(readCompletedEventName, false, true);
this._namedEventWriteCompleted = NamedEvent.CreateNamedEvent(writeCompletedEventName, false, true);
this._namedEventRemoteReadCompleted = NamedEvent.CreateNamedEvent(remoteReadCompletedEventName, false, true);
this._namedEventRemoteWriteCompleted = NamedEvent.CreateNamedEvent(remoteWriteCompletedEventName, false, true);
}
else
{
this.OpenSharedMemory();
if (this._closed != 0)
{
throw GenuineExceptions.Get_Connect_CanNotConnectToRemoteHost(name, "Remote host has already closed the connection.");
}
this._shareSize = this._writtenShareSize;
if (this._shareSize < MIN_SHARE_SIZE || this._shareSize > MAX_SHARE_SIZE)
{
throw GenuineExceptions.Get_Channel_InvalidParameter("SMShareSize");
}
this._receiveOffset = (this._shareSize - 5) / 2;
this._sendOffset = 5;
this._receiveSpaceSize = this._shareSize - this._receiveOffset - 8;
this._sendSpaceSize = this._receiveOffset - 5 - 8;
this._namedEventReadCompleted = NamedEvent.OpenNamedEvent(readCompletedEventName);
this._namedEventWriteCompleted = NamedEvent.OpenNamedEvent(writeCompletedEventName);
this._namedEventRemoteReadCompleted = NamedEvent.OpenNamedEvent(remoteReadCompletedEventName);
this._namedEventRemoteWriteCompleted = NamedEvent.OpenNamedEvent(remoteWriteCompletedEventName);
}
this._sendBuffer = new byte[this._sendSpaceSize];
}
/// <summary>
/// Opens a connection to the host specified by the url.
/// </summary>
/// <param name="remote">The HostInformation of the Remote Host.</param>
/// <param name="localUri">The uri of the local host.</param>
/// <param name="remoteUri">The uri of the remote host.</param>
/// <param name="remoteHostUniqueIdentifier">The unique identifier of the HostInformation used by the remote host.</param>
/// <returns>The established connection.</returns>
private SharedMemoryConnection LowLevel_OpenConnection(HostInformation remote, string localUri, out string remoteUri, out int remoteHostUniqueIdentifier)
{
using (new ReaderAutoLocker(this._disposeLock))
{
if (this._disposed)
{
throw OperationException.WrapException(this._disposeReason);
}
}
remoteUri = null;
Stream inputStream = null;
Stream outputStream = null;
string url = remote.Url;
// the maximum time during which the connection must be established
int timeout = GenuineUtility.GetTimeout((TimeSpan)this.ITransportContext.IParameterProvider[GenuineParameter.ConnectTimeout]);
IParameterProvider parameters = this.ITransportContext.IParameterProvider;
string mutexName = GenuineSharedMemoryChannel.ConstructSharedObjectName(
"MUTEX" + url, parameters);
string clientConnected = GenuineSharedMemoryChannel.ConstructSharedObjectName(
"CC" + url, parameters);
string clientAccepted = GenuineSharedMemoryChannel.ConstructSharedObjectName(
"CA" + url, parameters);
// open the server share
SharedMemoryConnection serverSharedMemoryConnection = new SharedMemoryConnection(this.ITransportContext, url, false, false);
// LOG:
BinaryLogWriter binaryLogWriter = this.ITransportContext.BinaryLogWriter;
if (binaryLogWriter != null && binaryLogWriter[LogCategory.Connection] > 0)
{
binaryLogWriter.WriteConnectionParameterEvent(LogCategory.Connection, "SharedMemoryConnectionManager.LowLevel_OpenConnection",
LogMessageType.ConnectionParameters, null, remote, this.ITransportContext.IParameterProvider,
GenuineUtility.CurrentThreadId, Thread.CurrentThread.Name, serverSharedMemoryConnection.DbgConnectionId,
"A Shared Memory connection is being established.");
}
// and create the local share
string shareName = "gshmem://" + Guid.NewGuid().ToString("N");
SharedMemoryConnection sharedMemoryConnection = new SharedMemoryConnection(this.ITransportContext, shareName, true, true);
BinaryWriter connectionInformation = MessageCoder.SerializeConnectionHeader(MessageCoder.PROTOCOL_VERSION, GenuineConnectionType.Persistent, "Default");
connectionInformation.Write(shareName);
// let the server know that a client's share is ready
Mutex mutex = null;
try
{
mutex = WindowsAPI.OpenMutex(mutexName);
NamedEvent _clientConnected = NamedEvent.OpenNamedEvent(clientConnected);
NamedEvent _clientAccepted = NamedEvent.OpenNamedEvent(clientAccepted);
if (!GenuineUtility.WaitOne(mutex, GenuineUtility.GetMillisecondsLeft(timeout)))
{
throw GenuineExceptions.Get_Connect_CanNotConnectToRemoteHost(url, "Can not acquire the lock for the global mutex.");
}
// wait until server accepts this client
_clientAccepted.ManualResetEvent.Reset();
_clientConnected.ManualResetEvent.Set();
// copy client's name
serverSharedMemoryConnection.LowLevel_SendSync(connectionInformation.BaseStream, timeout);
if (!GenuineUtility.WaitOne(_clientAccepted.ManualResetEvent, GenuineUtility.GetMillisecondsLeft(timeout)))
{
throw GenuineExceptions.Get_Connect_CanNotConnectToRemoteHost(url, "Remote server did not accept a request within the specified time span.");
}
}
finally
{
if (mutex != null)
{
try
{
mutex.ReleaseMutex();
}
catch
{
}
try
{
mutex.Close();
}
catch
{
}
}
}
// get the connection-level Security Session
string connectionLevelSSName = this.ITransportContext.IParameterProvider[GenuineParameter.SecuritySessionForPersistentConnections] as string;
SecuritySession securitySession = null;
if (connectionLevelSSName != null)
{
securitySession = this.ITransportContext.IKeyStore.GetKey(connectionLevelSSName).CreateSecuritySession(connectionLevelSSName, null);
}
// establish it
if (securitySession != null && !securitySession.IsEstablished)
{
bool firstPass = true;
for ( ; ;)
{
inputStream = Stream.Null;
try
{
// prepare streams
if (!firstPass)
{
inputStream = sharedMemoryConnection.LowLevel_ReadSync(timeout);
}
else
{
firstPass = false;
}
outputStream = securitySession.EstablishSession(inputStream, true);
if (outputStream == null)
{
break;
}
// send a packet to the remote host
sharedMemoryConnection.LowLevel_SendSync(outputStream, timeout);
if (securitySession.IsEstablished)
{
break;
}
}
finally
{
if (inputStream != null)
{
inputStream.Close();
}
if (outputStream != null)
{
outputStream.Close();
}
}
}
}
sharedMemoryConnection.ConnectionLevelSecurity = securitySession;
// now send connection info through the established connection
using (GenuineChunkedStream serializedLocalInfo = new GenuineChunkedStream(false))
{
// serialize local info
BinaryWriter binaryWriter = new BinaryWriter(serializedLocalInfo);
binaryWriter.Write((string)localUri);
binaryWriter.Write((int)remote.LocalHostUniqueIdentifier);
// and send it
sharedMemoryConnection.LowLevel_SendSync(serializedLocalInfo, timeout);
// read remote info
using (Stream remoteUriStream = sharedMemoryConnection.LowLevel_ReadSync(timeout))
{
BinaryReader binaryReader = new BinaryReader(remoteUriStream);
remoteUri = binaryReader.ReadString();
remoteHostUniqueIdentifier = binaryReader.ReadInt32();
}
}
sharedMemoryConnection.Remote = remote;
sharedMemoryConnection.Remote.UpdateUri(remoteUri, remoteHostUniqueIdentifier);
sharedMemoryConnection.Remote.GenuinePersistentConnectionState = GenuinePersistentConnectionState.Opened;
// LOG:
if (binaryLogWriter != null && binaryLogWriter[LogCategory.HostInformation] > 0)
{
binaryLogWriter.WriteHostInformationEvent("SharedMemoryConnectionManager.LowLevel_OpenConnection",
LogMessageType.HostInformationCreated, null, remote,
GenuineUtility.CurrentThreadId, Thread.CurrentThread.Name, null, null,
sharedMemoryConnection.DbgConnectionId,
"HostInformation is ready for actions.");
}
// LOG:
if (binaryLogWriter != null && binaryLogWriter[LogCategory.Connection] > 0)
{
binaryLogWriter.WriteEvent(LogCategory.Connection, "SharedMemoryConnectionManager.LowLevel_OpenConnection",
LogMessageType.ConnectionEstablished, null, null, remote, null,
GenuineUtility.CurrentThreadId, Thread.CurrentThread.Name,
securitySession, connectionLevelSSName,
sharedMemoryConnection.DbgConnectionId, (int)GenuineConnectionType.Persistent, 0, 0, this.GetType().Name, null, null, null,
"The connection to the remote host is established.");
}
return(sharedMemoryConnection);
}