/// <summary>
/// Releases the unmanaged resources used by the <see cref="DotRas.RasDialer"/> and optionally releases the managed resources.
/// </summary>
/// <param name="disposing"><b>true</b> to release both managed and unmanaged resources; <b>false</b> to release only unmanaged resources.</param>
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (this.IsBusy)
{
// The component is currently dialing a connection, abort the connection attempt.
this.Abort();
this.handle = null;
this.asyncOp = null;
}
if (this.timer != null)
{
this.timer.Dispose();
this.timer = null;
}
this.ReleaseEapIdentity();
this.Credentials = null;
this.dialCompletedCallback = null;
this.rasDialCallback = null;
this.timeoutCallback = null;
}
base.Dispose(disposing);
}
public DialCompletedEventArgs(RasHandle handle, Exception error, bool cancelled, bool timedOut, bool connected, object userState)
: base(error, cancelled, userState)
{
Handle = handle;
TimedOut = timedOut;
Connected = connected;
}
private bool RasDialCallback(IntPtr callbackId, int subEntryId, IntPtr dangerousHandle, int message, RasConnectionState state, int errorCode, int extendedErrorCode)
{
bool retval = true;
lock (this.syncRoot)
{
RasHandle connectionHandle = null;
try
{
connectionHandle = new RasHandle(dangerousHandle, subEntryId > 1);
if (!this.IsBusy)
{
// The connection is no longer being dialed, stop receiving notifications for this connection attempt.
retval = false;
}
else
{
string errorMessage = null;
if (errorCode != NativeMethods.SUCCESS)
{
errorMessage = RasHelper.Default.GetRasErrorString(errorCode);
}
StateChangedEventArgs e = new StateChangedEventArgs(callbackId, subEntryId, connectionHandle, state, errorCode, errorMessage, extendedErrorCode);
this.OnStateChanged(e);
if (errorCode != NativeMethods.SUCCESS)
{
this.Abort();
this.PostCompleted(new RasDialException(errorCode, extendedErrorCode), false, false, false);
retval = false;
}
else if (state == RasConnectionState.Connected)
{
this.PostCompleted(null, false, false, true);
}
}
}
catch (Exception ex)
{
this.OnError(new System.IO.ErrorEventArgs(ex));
}
finally
{
DiagnosticTrace.Default.TraceEvent(TraceEventType.Verbose, new RasDialCallbackTraceEvent(retval, callbackId, subEntryId, dangerousHandle, message, state, errorCode, extendedErrorCode));
if (connectionHandle != null)
{
connectionHandle.Dispose();
}
}
}
return(retval);
}
/// <summary>
/// Initializes a new instance of the <see cref="DotRas.StateChangedEventArgs"/> class.
/// </summary>
/// <param name="callbackId">The application defined value that was specified during dialing.</param>
/// <param name="subEntryId">The one-based index for the phone book entry associated with this connection.</param>
/// <param name="handle">The handle of the connection.</param>
/// <param name="state">The state the remote access connection is about to enter.</param>
/// <param name="errorCode">The error code (if any) that occurred.</param>
/// <param name="errorMessage">The error message of the <paramref name="errorCode"/> that occurred.</param>
/// <param name="extendedErrorCode">The extended error code (if any) that occurred.</param>
internal StateChangedEventArgs(IntPtr callbackId, int subEntryId, RasHandle handle, RasConnectionState state, int errorCode, string errorMessage, int extendedErrorCode)
{
this.CallbackId = callbackId;
this.SubEntryId = subEntryId;
this.Handle = handle;
this.State = state;
this.ErrorCode = errorCode;
this.ErrorMessage = errorMessage;
this.ExtendedErrorCode = extendedErrorCode;
}
private void Register(NativeMethods.RASCN changeType, RasHandle handle)
{
AutoResetEvent waitObject = new AutoResetEvent(false);
int ret = SafeNativeMethods.Instance.RegisterConnectionNotification(handle, waitObject.SafeWaitHandle, changeType);
if (ret == NativeMethods.SUCCESS)
{
RasConnectionWatcherStateObject stateObject = new RasConnectionWatcherStateObject(changeType);
stateObject.WaitObject = waitObject;
stateObject.WaitHandle = ThreadPool.RegisterWaitForSingleObject(waitObject, new WaitOrTimerCallback(this.ConnectionStateChanged), stateObject, Timeout.Infinite, false);
this._stateObjects.Add(stateObject);
}
}
public static RasConnection GetActiveConnectionByHandle(RasHandle handle)
{
if (handle == null)
{
ThrowHelper.ThrowArgumentNullException("handle");
}
RasConnection retval = null;
foreach (RasConnection connection in GetActiveConnections())
{
if (connection.Handle == handle)
{
retval = connection;
break;
}
}
return(retval);
}
/// <summary>
/// Notifies the asynchronous operation in progress the operation has completed.
/// </summary>
/// <param name="error">Any error that occurred during the asynchronous operation.</param>
/// <param name="cancelled"><b>true</b> if the asynchronous operation was cancelled, otherwise <b>false</b>.</param>
/// <param name="timedOut"><b>true</b> if the operation timed out, otherwise <b>false</b>.</param>
/// <param name="connected"><b>true</b> if the connection attempt successfully connected, otherwise <b>false</b>.</param>
private void PostCompleted(Exception error, bool cancelled, bool timedOut, bool connected)
{
lock (this.syncRoot)
{
if (connected)
{
// The client has connected successfully, attempt to update the credentials.
this.SaveCredentialsToPhoneBook();
}
this.ReleaseEapIdentity();
this.IsBusy = false;
if (this.asyncOp != null)
{
this.asyncOp.PostOperationCompleted(this.dialCompletedCallback, new DialCompletedEventArgs(this.handle, error, cancelled, timedOut, connected, null));
this.asyncOp = null;
this.handle = null;
this.timer = null;
}
}
}
/// <summary>
/// Performs the dialing operation.
/// </summary>
/// <param name="asynchronous"><b>true</b> if the dialing operation should be asynchronous, otherwise <b>false</b>.</param>
/// <returns>The handle of the connection.</returns>
/// <exception cref="System.InvalidOperationException">A phone number or an entry name with phone book path is required to dial.</exception>
private RasHandle InternalDial(bool asynchronous)
{
if (string.IsNullOrEmpty(this.PhoneNumber) && (string.IsNullOrEmpty(this.EntryName) || string.IsNullOrEmpty(this.PhoneBookPath)))
{
ThrowHelper.ThrowInvalidOperationException(Resources.Exception_PhoneNumberOrEntryNameRequired);
}
lock (this.syncRoot)
{
// NOTE: The synchronization object MUST be locked prior to testing of the component is already busy.
// WARNING! Ensure no exceptions are thrown because existing dial attempts are already in progress. Doing so leaves the
// connection open and cannot be closed if the application is terminated.
if (!this.IsBusy)
{
this.IsBusy = true;
try
{
NativeMethods.RASDIALPARAMS parameters = this.BuildDialParams();
NativeMethods.RASDIALEXTENSIONS extensions = this.BuildDialExtensions();
if (!string.IsNullOrEmpty(this.EntryName))
{
byte[] data = null;
if (this.eapUserData != null)
{
data = this.eapUserData;
}
else
{
data = RasHelper.Default.GetEapUserData(IntPtr.Zero, this.PhoneBookPath, this.EntryName);
}
if (data != null)
{
this.eapDataAddress = Marshal.AllocHGlobal(data.Length);
Marshal.Copy(data, 0, this.eapDataAddress, data.Length);
extensions.eapInfo.eapData = this.eapDataAddress;
extensions.eapInfo.sizeOfEapData = data.Length;
}
}
NativeMethods.RasDialFunc2 callback = null;
if (asynchronous)
{
callback = this.rasDialCallback;
this.asyncOp = AsyncOperationManager.CreateOperation(null);
if (this.timer != null)
{
// Dispose of any existing timer if the component is being reused.
this.timer.Dispose();
this.timer = null;
}
if (this.Timeout != System.Threading.Timeout.Infinite)
{
// A timeout has been requested, create the timer used to handle the connection timeout.
this.timer = new Timer(this.timeoutCallback, null, this.Timeout, System.Threading.Timeout.Infinite);
}
}
this.handle = RasHelper.Default.Dial(this.PhoneBookPath, parameters, extensions, callback, this.GetRasEapOptions());
if (!asynchronous)
{
this.SaveCredentialsToPhoneBook();
this.ReleaseEapIdentity();
// The synchronous dialing operation has completed, reset the dialing flag so the component can be reused.
this.IsBusy = false;
}
}
catch (Exception)
{
// An exception was thrown when the component was attempting to dial a connection. Release the EAP identity and reset the dialing flag so the component can be reused.
this.ReleaseEapIdentity();
this.IsBusy = false;
throw;
}
}
}
return(this.handle);
}
/// <summary>
/// Initializes a new instance of the <see cref="DotRas.InvalidHandleException"/> class.
/// </summary>
/// <param name="handle">The <see cref="DotRas.RasHandle"/> that caused the exception.</param>
/// <param name="message">A message that describes the error.</param>
/// <param name="innerException">The exception that is the cause of the current exception, or null reference (<b>Nothing</b> in Visual Basic) if no inner exception is specified.</param>
public InvalidHandleException(RasHandle handle, string message, Exception innerException)
: base(message, innerException)
{
this.Handle = handle;
}
/// <summary>
/// Initializes a new instance of the <see cref="DotRas.InvalidHandleException"/> class.
/// </summary>
/// <param name="handle">The <see cref="DotRas.RasHandle"/> that caused the exception.</param>
/// <param name="message">A message that describes the error.</param>
public InvalidHandleException(RasHandle handle, string message)
: this(handle, message, null)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="DotRas.InvalidHandleException"/> class.
/// </summary>
/// <param name="handle">The <see cref="DotRas.RasHandle"/> that caused the exception.</param>
public InvalidHandleException(RasHandle handle)
: this(handle, null)
{
}
