internal ReceiveState(CommandStream connection)
{
this.Connection = connection;
this.Resp = new ResponseDescription();
this.Buffer = new byte[0x400];
this.ValidThrough = 0;
}
protected void InitCommandPipeline(WebRequest request, PipelineEntry[] commands, bool isAsync)
{
_commands = commands;
_index = 0;
_request = request;
_aborted = false;
_doRead = true;
_doSend = true;
_currentResponseDescription = null;
_isAsync = isAsync;
_recoverableFailure = false;
_abortReason = string.Empty;
}
protected void InitCommandPipeline(WebRequest request, PipelineEntry [] commands, bool async)
{
m_Commands = commands;
m_Index = 0;
m_Request = request;
m_Aborted = false;
m_DoRead = true;
m_DoSend = true;
m_CurrentResponseDescription = null;
m_Async = async;
m_RecoverableFailure = false;
m_AbortReason = string.Empty;
}
//
private bool PostSendCommandProcessing(ref Stream stream)
{
/*
** I don;t see how this code can be still relevant, remove it of no problems observed **
**
** //
** // This is a general race condition in [....] mode, if the server returns an error
** // after we open the data connection, we will be off reading the data connection,
** // and not the control connection. The best we can do is try to poll, and in the
** // the worst case, we will timeout on establishing the data connection.
** //
** if (!m_DoRead && !m_Async) {
** m_DoRead = Poll(100 * 1000, SelectMode.SelectRead); // Poll is in Microseconds.
** }
*/
if (m_DoRead)
{
// In async case, The next call can actually result in a
// series of synchronous completions that eventually close
// the connection. So we need to save the members that
// we need to access, since they may not be valid after the
// next call returns
bool async = m_Async;
int index = m_Index;
PipelineEntry[] commands = m_Commands;
try {
ResponseDescription response = ReceiveCommandResponse();
if (async)
{
return(true);
}
m_CurrentResponseDescription = response;
} catch {
// If we get an exception on the QUIT command (which is
// always the last command), ignore the final exception
// and continue with the pipeline regardlss of [....]/async
if (index < 0 || index >= commands.Length ||
commands[index].Command != "QUIT\r\n")
{
throw;
}
}
}
return(PostReadCommandProcessing(ref stream));
}
private bool PostSendCommandProcessing(ref Stream stream)
{
if (_doRead)
{
// In async case, the next call can actually result in a
// series of synchronous completions that eventually close
// the connection. So we need to save the members that
// we need to access, since they may not be valid after the
// next call returns
bool isAsync = _isAsync;
int index = _index;
PipelineEntry[] commands = _commands;
try
{
ResponseDescription response = ReceiveCommandResponse();
if (isAsync)
{
return(true);
}
_currentResponseDescription = response;
}
catch
{
// If we get an exception on the QUIT command (which is
// always the last command), ignore the final exception
// and continue with the pipeline regardlss of sync/async
if (index < 0 || index >= commands.Length ||
commands[index].Command != "QUIT\r\n")
{
throw;
}
}
}
return(PostReadCommandProcessing(ref stream));
}
/// <summary>
/// This function is called a derived class to determine whether a response is valid, and when it is complete.
/// </summary>
protected virtual bool CheckValid(ResponseDescription response, ref int validThrough, ref int completeLength)
{
return(false);
}
protected override bool CheckValid(ResponseDescription response, ref int validThrough, ref int completeLength)
{
if (response.StatusBuffer.Length >= 4)
{
string str = response.StatusBuffer.ToString();
if (response.Status == -1)
{
if ((!char.IsDigit(str[0]) || !char.IsDigit(str[1])) || (!char.IsDigit(str[2]) || ((str[3] != ' ') && (str[3] != '-'))))
{
return false;
}
response.StatusCodeString = str.Substring(0, 3);
response.Status = Convert.ToInt16(response.StatusCodeString, NumberFormatInfo.InvariantInfo);
if (str[3] == '-')
{
response.Multiline = true;
}
}
int num = 0;
while ((num = str.IndexOf("\r\n", validThrough)) != -1)
{
int startIndex = validThrough;
validThrough = num + 2;
if (!response.Multiline)
{
completeLength = validThrough;
return true;
}
if (((str.Length > (startIndex + 4)) && (str.Substring(startIndex, 3) == response.StatusCodeString)) && (str[startIndex + 3] == ' '))
{
completeLength = validThrough;
return true;
}
}
}
return true;
}
/// <summary>
/// This function is implemented in a derived class to determine whether a response is valid, and when it is complete.
/// </summary>
protected virtual bool CheckValid(ResponseDescription response, ref int validThrough, ref int completeLength)
{
return false;
}
private bool PostReadCommandProcessing(ref Stream stream)
{
if (_index >= _commands.Length)
return false;
// Set up front to prevent a race condition on result == PipelineInstruction.Pause
_doSend = false;
_doRead = false;
PipelineInstruction result;
PipelineEntry entry;
if (_index == -1)
entry = null;
else
entry = _commands[_index];
// Final QUIT command may get exceptions since the connection
// may be already closed by the server. So there is no response
// to process, just advance the pipeline to continue.
if (_currentResponseDescription == null && entry.Command == "QUIT\r\n")
result = PipelineInstruction.Advance;
else
result = PipelineCallback(entry, _currentResponseDescription, false, ref stream);
if (result == PipelineInstruction.Abort)
{
Exception exception;
if (_abortReason != string.Empty)
exception = new WebException(_abortReason);
else
exception = GenerateException(SR.net_ftp_protocolerror, WebExceptionStatus.ServerProtocolViolation, null);
Abort(exception);
throw exception;
}
else if (result == PipelineInstruction.Advance)
{
_currentResponseDescription = null;
_doSend = true;
_doRead = true;
_index++;
}
else if (result == PipelineInstruction.Pause)
{
// PipelineCallback did an async operation and will have to re-enter again.
// Hold on for now.
return true;
}
else if (result == PipelineInstruction.GiveStream)
{
// We will have another response coming, don't send
_currentResponseDescription = null;
_doRead = true;
if (_isAsync)
{
// If they block in the requestcallback we should still continue the pipeline
ContinueCommandPipeline();
InvokeRequestCallback(stream);
}
return true;
}
else if (result == PipelineInstruction.Reread)
{
// Another response is expected after this one
_currentResponseDescription = null;
_doRead = true;
}
return false;
}
protected void InitCommandPipeline(WebRequest request, PipelineEntry[] commands, bool isAsync)
{
_commands = commands;
_index = 0;
_request = request;
_aborted = false;
_doRead = true;
_doSend = true;
_currentResponseDescription = null;
_isAsync = isAsync;
_recoverableFailure = false;
_abortReason = string.Empty;
}
// This is called by underlying base class code, each time a new response is received from the wire or a protocol stage is resumed.
// This function controls the setting up of a data socket/connection, and of saving off the server responses.
protected override PipelineInstruction PipelineCallback(PipelineEntry entry, ResponseDescription response, bool timeout, ref Stream stream)
{
if (NetEventSource.IsEnabled) NetEventSource.Info(this, $"Command:{entry?.Command} Description:{response?.StatusDescription}");
// null response is not expected
if (response == null)
return PipelineInstruction.Abort;
FtpStatusCode status = (FtpStatusCode)response.Status;
//
// Update global "current status" for FtpWebRequest
//
if (status != FtpStatusCode.ClosingControl)
{
// A 221 status won't be reflected on the user FTP response
// Anything else will (by design?)
StatusCode = status;
StatusLine = response.StatusDescription;
}
// If the status code is outside the range defined in RFC (1xx to 5xx) throw
if (response.InvalidStatusCode)
throw new WebException(SR.net_InvalidStatusCode, WebExceptionStatus.ProtocolError);
// Update the banner message if any, this is a little hack because the "entry" param is null
if (_index == -1)
{
if (status == FtpStatusCode.SendUserCommand)
{
_bannerMessage = new StringBuilder();
_bannerMessage.Append(StatusLine);
return PipelineInstruction.Advance;
}
else if (status == FtpStatusCode.ServiceTemporarilyNotAvailable)
{
return PipelineInstruction.Reread;
}
else
throw GenerateException(status, response.StatusDescription, null);
}
//
// Check for the result of our attempt to use UTF8
//
if (entry.Command == "OPTS utf8 on\r\n")
{
if (response.PositiveCompletion)
{
Encoding = Encoding.UTF8;
}
else
{
Encoding = Encoding.Default;
}
return PipelineInstruction.Advance;
}
// If we are already logged in and the server returns 530 then
// the server does not support re-issuing a USER command,
// tear down the connection and start all over again
if (entry.Command.IndexOf("USER") != -1)
{
// The server may not require a password for this user, so bypass the password command
if (status == FtpStatusCode.LoggedInProceed)
{
_loginState = FtpLoginState.LoggedIn;
_index++;
}
}
//
// Throw on an error with possible recovery option
//
if (response.TransientFailure || response.PermanentFailure)
{
if (status == FtpStatusCode.ServiceNotAvailable)
{
MarkAsRecoverableFailure();
}
throw GenerateException(status, response.StatusDescription, null);
}
if (_loginState != FtpLoginState.LoggedIn
&& entry.Command.IndexOf("PASS") != -1)
{
// Note the fact that we logged in
if (status == FtpStatusCode.NeedLoginAccount || status == FtpStatusCode.LoggedInProceed)
_loginState = FtpLoginState.LoggedIn;
else
throw GenerateException(status, response.StatusDescription, null);
}
//
// Parse special cases
//
if (entry.HasFlag(PipelineEntryFlags.CreateDataConnection) && (response.PositiveCompletion || response.PositiveIntermediate))
{
bool isSocketReady;
PipelineInstruction result = QueueOrCreateDataConection(entry, response, timeout, ref stream, out isSocketReady);
if (!isSocketReady)
return result;
// otheriwse we have a stream to create
}
//
// This is part of the above case and it's all about giving data stream back
//
if (status == FtpStatusCode.OpeningData || status == FtpStatusCode.DataAlreadyOpen)
{
if (_dataSocket == null)
{
return PipelineInstruction.Abort;
}
if (!entry.HasFlag(PipelineEntryFlags.GiveDataStream))
{
_abortReason = SR.Format(SR.net_ftp_invalid_status_response, status, entry.Command);
return PipelineInstruction.Abort;
}
// Parse out the Content length, if we can
TryUpdateContentLength(response.StatusDescription);
// Parse out the file name, when it is returned and use it for our ResponseUri
FtpWebRequest request = (FtpWebRequest)_request;
if (request.MethodInfo.ShouldParseForResponseUri)
{
TryUpdateResponseUri(response.StatusDescription, request);
}
return QueueOrCreateFtpDataStream(ref stream);
}
//
// Parse responses by status code exclusivelly
//
// Update welcome message
if (status == FtpStatusCode.LoggedInProceed)
{
_welcomeMessage.Append(StatusLine);
}
// OR set the user response ExitMessage
else if (status == FtpStatusCode.ClosingControl)
{
_exitMessage.Append(response.StatusDescription);
// And close the control stream socket on "QUIT"
CloseSocket();
}
// OR set us up for SSL/TLS, after this we'll be writing securely
else if (status == FtpStatusCode.ServerWantsSecureSession)
{
// If NetworkStream is a TlsStream, then this must be in the async callback
// from completing the SSL handshake.
// So just let the pipeline continue.
if (!(NetworkStream is TlsStream))
{
FtpWebRequest request = (FtpWebRequest)_request;
TlsStream tlsStream = new TlsStream(NetworkStream, Socket, request.RequestUri.Host, request.ClientCertificates);
if (_isAsync)
{
tlsStream.BeginAuthenticateAsClient(ar =>
{
try
{
tlsStream.EndAuthenticateAsClient(ar);
NetworkStream = tlsStream;
this.ContinueCommandPipeline();
}
catch (Exception e)
{
this.CloseSocket();
this.InvokeRequestCallback(e);
}
}, null);
return PipelineInstruction.Pause;
}
else
{
tlsStream.AuthenticateAsClient();
NetworkStream = tlsStream;
}
}
}
// OR parse out the file size or file time, usually a result of sending SIZE/MDTM commands
else if (status == FtpStatusCode.FileStatus)
{
FtpWebRequest request = (FtpWebRequest)_request;
if (entry.Command.StartsWith("SIZE "))
{
_contentLength = GetContentLengthFrom213Response(response.StatusDescription);
}
else if (entry.Command.StartsWith("MDTM "))
{
_lastModified = GetLastModifiedFrom213Response(response.StatusDescription);
}
}
// OR parse out our login directory
else if (status == FtpStatusCode.PathnameCreated)
{
if (entry.Command == "PWD\r\n" && !entry.HasFlag(PipelineEntryFlags.UserCommand))
{
_loginDirectory = GetLoginDirectory(response.StatusDescription);
}
}
// Asserting we have some positive response
else
{
// We only use CWD to reset ourselves back to the login directory.
if (entry.Command.IndexOf("CWD") != -1)
{
_establishedServerDirectory = _requestedServerDirectory;
}
}
// Intermediate responses require rereading
if (response.PositiveIntermediate || (!UsingSecureStream && entry.Command == "AUTH TLS\r\n"))
{
return PipelineInstruction.Reread;
}
return PipelineInstruction.Advance;
}
//
private bool PostSendCommandProcessing(ref Stream stream)
{
/*
** I don;t see how this code can be still relevant, remove it of no problems observed **
//
// This is a general race condition in Sync mode, if the server returns an error
// after we open the data connection, we will be off reading the data connection,
// and not the control connection. The best we can do is try to poll, and in the
// the worst case, we will timeout on establishing the data connection.
//
if (!m_DoRead && !m_Async) {
m_DoRead = Poll(100 * 1000, SelectMode.SelectRead); // Poll is in Microseconds.
}
*/
if (m_DoRead)
{
// In async case, The next call can actually result in a
// series of synchronous completions that eventually close
// the connection. So we need to save the members that
// we need to access, since they may not be valid after the
// next call returns
bool async = m_Async;
int index = m_Index;
PipelineEntry[] commands = m_Commands;
try {
ResponseDescription response = ReceiveCommandResponse();
if (async) {
return true;
}
m_CurrentResponseDescription = response;
} catch {
// If we get an exception on the QUIT command (which is
// always the last command), ignore the final exception
// and continue with the pipeline regardlss of sync/async
if (index < 0 || index >= commands.Length ||
commands[index].Command != "QUIT\r\n")
throw;
}
}
return PostReadCommandProcessing(ref stream);
}
private bool PostReadCommandProcessing(ref Stream stream)
{
if (this.m_Index < this.m_Commands.Length)
{
PipelineInstruction advance;
PipelineEntry entry;
this.m_DoSend = false;
this.m_DoRead = false;
if (this.m_Index == -1)
{
entry = null;
}
else
{
entry = this.m_Commands[this.m_Index];
}
if ((this.m_CurrentResponseDescription == null) && (entry.Command == "QUIT\r\n"))
{
advance = PipelineInstruction.Advance;
}
else
{
advance = this.PipelineCallback(entry, this.m_CurrentResponseDescription, false, ref stream);
}
switch (advance)
{
case PipelineInstruction.Advance:
this.m_CurrentResponseDescription = null;
this.m_DoSend = true;
this.m_DoRead = true;
this.m_Index++;
break;
case PipelineInstruction.Pause:
return true;
case PipelineInstruction.Abort:
Exception exception;
if (this.m_AbortReason != string.Empty)
{
exception = new WebException(this.m_AbortReason);
}
else
{
exception = this.GenerateException(WebExceptionStatus.ServerProtocolViolation, null);
}
this.Abort(exception);
throw exception;
case PipelineInstruction.GiveStream:
this.m_CurrentResponseDescription = null;
this.m_DoRead = true;
if (this.m_Async)
{
this.ContinueCommandPipeline();
this.InvokeRequestCallback(stream);
}
return true;
case PipelineInstruction.Reread:
this.m_CurrentResponseDescription = null;
this.m_DoRead = true;
break;
}
}
return false;
}
private PipelineInstruction QueueOrCreateDataConection(PipelineEntry entry, ResponseDescription response, bool timeout, ref Stream stream, out bool isSocketReady)
{
isSocketReady = false;
if (m_DataHandshakeStarted)
{
isSocketReady = true;
return PipelineInstruction.Pause; //if we already started then this is re-entering into the callback where we proceed with the stream
}
m_DataHandshakeStarted = true;
// handle passive responses by parsing the port and later doing a Connect(...)
bool isPassive = false;
int port = -1;
if (entry.Command == "PASV\r\n" || entry.Command == "EPSV\r\n")
{
if (!response.PositiveCompletion)
{
m_AbortReason = SR.GetString(SR.net_ftp_server_failed_passive, response.Status);
return PipelineInstruction.Abort;
}
if (entry.Command == "PASV\r\n")
{
port = GetPortV4(response.StatusDescription);
} else {
port = GetPortV6(response.StatusDescription);
}
isPassive = true;
}
new SocketPermission(PermissionState.Unrestricted).Assert();
try {
if (isPassive)
{
GlobalLog.Assert(port != -1, "FtpControlStream#{0}|'port' not set.", ValidationHelper.HashString(this));
try {
m_DataSocket = CreateFtpDataSocket((FtpWebRequest)m_Request, Socket);
} catch (ObjectDisposedException) {
throw ExceptionHelper.RequestAbortedException;
}
IPEndPoint localEndPoint = new IPEndPoint(((IPEndPoint)Socket.LocalEndPoint).Address, 0);
m_DataSocket.Bind(localEndPoint);
m_PassiveEndPoint = new IPEndPoint(ServerAddress, port);
}
PipelineInstruction result;
if (m_PassiveEndPoint != null)
{
IPEndPoint passiveEndPoint = m_PassiveEndPoint;
m_PassiveEndPoint = null;
GlobalLog.Print("FtpControlStream#" + ValidationHelper.HashString(this) + "starting Connect()");
if (m_Async)
{
m_DataSocket.BeginConnect(passiveEndPoint, m_ConnectCallbackDelegate, this);
result = PipelineInstruction.Pause;
}
else
{
m_DataSocket.Connect(passiveEndPoint);
result = PipelineInstruction.Advance; // for passive mode we end up going to the next command
}
}
else
{
GlobalLog.Print("FtpControlStream#" + ValidationHelper.HashString(this) + "starting Accept()");
if (m_Async)
{
m_DataSocket.BeginAccept(m_AcceptCallbackDelegate, this);
result = PipelineInstruction.Pause;
}
else
{
Socket listenSocket = m_DataSocket;
try {
m_DataSocket = m_DataSocket.Accept();
if (!ServerAddress.Equals(((IPEndPoint)m_DataSocket.RemoteEndPoint).Address))
{
m_DataSocket.Close();
throw new WebException(SR.GetString(SR.net_ftp_active_address_different), WebExceptionStatus.ProtocolError);
}
isSocketReady = true; // for active mode we end up creating a stream before advancing the pipeline
result = PipelineInstruction.Pause;
} finally {
listenSocket.Close();
}
}
}
return result;
} finally {
SocketPermission.RevertAssert();
}
}
//
// This is called by underlying base class code, each time a new response is received from the wire or a protocol stage is resumed.
// This function controls the seting up of a data socket/connection, and of saving off the server responses
//
protected override PipelineInstruction PipelineCallback(PipelineEntry entry, ResponseDescription response, bool timeout, ref Stream stream)
{
GlobalLog.Print("FtpControlStream#" + ValidationHelper.HashString(this) + ">" + (entry == null? "null" : entry.Command));
GlobalLog.Print("FtpControlStream#" + ValidationHelper.HashString(this) + ">" + ((response == null) ? "null" : response.StatusDescription));
// null response is not expected
if (response == null)
return PipelineInstruction.Abort;
FtpStatusCode status = (FtpStatusCode) response.Status;
//
// Update global "current status" for FtpWebRequest
//
if (status != FtpStatusCode.ClosingControl)
{
// A 221 status won't be reflected on the user FTP response
// Anything else will (by design?)
StatusCode = status;
StatusLine = response.StatusDescription;
}
// If the status code is outside the range defined in RFC (1xx to 5xx) throw
if (response.InvalidStatusCode)
throw new WebException(SR.GetString(SR.net_InvalidStatusCode), WebExceptionStatus.ProtocolError);
// Update the banner message if any, this is a little hack because the "entry" param is null
if (m_Index == -1) {
if (status == FtpStatusCode.SendUserCommand)
{
m_BannerMessage = new StringBuilder();
m_BannerMessage.Append(StatusLine);
return PipelineInstruction.Advance;
}
else if (status == FtpStatusCode.ServiceTemporarilyNotAvailable)
{
return PipelineInstruction.Reread;
}
else
throw GenerateException(status,response.StatusDescription, null);
}
//
// Check for the result of our attempt to use UTF8
// Condsider: optimize this for speed (avoid string compare) as that is the only command that may fail
//
if (entry.Command == "OPTS utf8 on\r\n")
{
if (response.PositiveCompletion) {
Encoding = Encoding.UTF8;
} else {
Encoding = Encoding.Default;
}
return PipelineInstruction.Advance;
}
// If we are already logged in and the server returns 530 then
// the server does not support re-issuing a USER command,
// tear down the connection and start all over again
if (entry.Command.IndexOf("USER") != -1)
{
// The server may not require a password for this user, so bypass the password command
if (status == FtpStatusCode.LoggedInProceed)
{
m_LoginState = FtpLoginState.LoggedIn;
m_Index++;
}
// The server does not like re-login
// (We are logged in already but want to re-login under a different user)
else if (status == FtpStatusCode.NotLoggedIn &&
m_LoginState != FtpLoginState.NotLoggedIn)
{
m_LoginState = FtpLoginState.ReloginFailed;
throw ExceptionHelper.IsolatedException;
}
}
//
// Throw on an error with possible recovery option
//
if (response.TransientFailure || response.PermanentFailure) {
if (status == FtpStatusCode.ServiceNotAvailable) {
MarkAsRecoverableFailure();
}
throw GenerateException(status,response.StatusDescription, null);
}
if (m_LoginState != FtpLoginState.LoggedIn
&& entry.Command.IndexOf("PASS") != -1)
{
// Note the fact that we logged in
if (status == FtpStatusCode.NeedLoginAccount || status == FtpStatusCode.LoggedInProceed)
m_LoginState = FtpLoginState.LoggedIn;
else
throw GenerateException(status,response.StatusDescription, null);
}
//
// Parse special cases
//
if (entry.HasFlag(PipelineEntryFlags.CreateDataConnection) && (response.PositiveCompletion || response.PositiveIntermediate))
{
bool isSocketReady;
PipelineInstruction result = QueueOrCreateDataConection(entry, response, timeout, ref stream, out isSocketReady);
if (!isSocketReady)
return result;
// otheriwse we have a stream to create
}
//
// This is part of the above case and it's all about giving data stream back
//
if (status == FtpStatusCode.OpeningData || status == FtpStatusCode.DataAlreadyOpen)
{
if (m_DataSocket == null)
{
// a better diagnostic?
return PipelineInstruction.Abort;
}
if (!entry.HasFlag(PipelineEntryFlags.GiveDataStream))
{
m_AbortReason = SR.GetString(SR.net_ftp_invalid_status_response, status, entry.Command);
return PipelineInstruction.Abort;
}
// Parse out the Content length, if we can
TryUpdateContentLength(response.StatusDescription);
// Parse out the file name, when it is returned and use it for our ResponseUri
FtpWebRequest request = (FtpWebRequest) m_Request;
if (request.MethodInfo.ShouldParseForResponseUri)
{
TryUpdateResponseUri(response.StatusDescription, request);
}
return QueueOrCreateFtpDataStream(ref stream);
}
//
// Parse responses by status code exclusivelly
//
//Update welcome message
if (status == FtpStatusCode.LoggedInProceed)
{
m_WelcomeMessage.Append(StatusLine);
}
// OR set the user response ExitMessage
else if (status == FtpStatusCode.ClosingControl)
{
m_ExitMessage.Append(response.StatusDescription);
// And close the control stream socket on "QUIT"
CloseSocket();
}
#if !FEATURE_PAL
// OR set us up for SSL/TLS, after this we'll be writing securely
else if (status == FtpStatusCode.ServerWantsSecureSession)
{
FtpWebRequest request = (FtpWebRequest) m_Request;
TlsStream tlsStream = new TlsStream(request.RequestUri.Host, NetworkStream, request.ClientCertificates, Pool.ServicePoint, request, m_Async ? request.GetWritingContext().ContextCopy : null);
NetworkStream = tlsStream;
}
#endif // !FEATURE_PAL
// OR parse out the file size or file time, usually a result of sending SIZE/MDTM commands
else if (status == FtpStatusCode.FileStatus)
{
FtpWebRequest request = (FtpWebRequest) m_Request;
if (entry.Command.StartsWith("SIZE ")) {
m_ContentLength = GetContentLengthFrom213Response(response.StatusDescription);
} else if (entry.Command.StartsWith("MDTM ")) {
m_LastModified = GetLastModifiedFrom213Response(response.StatusDescription);
}
}
// OR parse out our login directory
else if (status == FtpStatusCode.PathnameCreated)
{
if (entry.Command == "PWD\r\n" && !entry.HasFlag(PipelineEntryFlags.UserCommand))
{
m_LoginDirectory = GetLoginDirectory(response.StatusDescription);
}
}
// Asserting we have some positive response
else
{
// We only use CWD to reset ourselves back to the login directory.
if (entry.Command.IndexOf("CWD") != -1)
{
m_EstablishedServerDirectory = m_RequestedServerDirectory;
}
}
// Intermediate responses require rereading
if (response.PositiveIntermediate || (!UsingSecureStream && entry.Command == "AUTH TLS\r\n"))
{
return PipelineInstruction.Reread;
}
return PipelineInstruction.Advance;
}
//
// This is called by underlying base class code, each time a new response is received from the wire or a protocol stage is resumed.
// This function controls the seting up of a data socket/connection, and of saving off the server responses
//
protected override PipelineInstruction PipelineCallback(PipelineEntry entry, ResponseDescription response, bool timeout, ref Stream stream)
{
GlobalLog.Print("FtpControlStream#" + ValidationHelper.HashString(this) + ">" + (entry == null? "null" : entry.Command));
GlobalLog.Print("FtpControlStream#" + ValidationHelper.HashString(this) + ">" + ((response == null) ? "null" : response.StatusDescription));
// null response is not expected
if (response == null)
return PipelineInstruction.Abort;
FtpStatusCode status = (FtpStatusCode) response.Status;
//
// Update global "current status" for FtpWebRequest
//
if (status != FtpStatusCode.ClosingControl)
{
// A 221 status won't be reflected on the user FTP response
// Anything else will (by design?)
StatusCode = status;
StatusLine = response.StatusDescription;
}
// If the status code is outside the range defined in RFC (1xx to 5xx) throw
if (response.InvalidStatusCode)
throw new WebException(SR.GetString(SR.net_InvalidStatusCode), WebExceptionStatus.ProtocolError);
if (m_Index == -1) {
if (status == FtpStatusCode.SendUserCommand)
{
m_BannerMessage = new StringBuilder();
m_BannerMessage.Append(StatusLine);
return PipelineInstruction.Advance;
}
else if (status == FtpStatusCode.ServiceTemporarilyNotAvailable)
{
return PipelineInstruction.Reread;
}
else
throw GenerateException(status,response.StatusDescription, null);
}
//
// Check for the result of our attempt to use UTF8
// Condsider: optimize this for speed (avoid string compare) as that is the only command that may fail
//
if (entry.Command == "OPTS utf8 on\r\n")
{
if (response.PositiveCompletion) {
Encoding = Encoding.UTF8;
} else {
Encoding = Encoding.Default;
}
return PipelineInstruction.Advance;
}
// If we are already logged in and the server returns 530 then
// the server does not support re-issuing a USER command,
// tear down the connection and start all over again
if (entry.Command.IndexOf("USER") != -1)
{
// The server may not require a password for this user, so bypass the password command
if (status == FtpStatusCode.LoggedInProceed)
{
m_LoginState = FtpLoginState.LoggedIn;
m_Index++;
}
// The server does not like re-login
// (We are logged in already but want to re-login under a different user)
else if (status == FtpStatusCode.NotLoggedIn &&
m_LoginState != FtpLoginState.NotLoggedIn)
{
m_LoginState = FtpLoginState.ReloginFailed;
throw ExceptionHelper.IsolatedException;
}
}
//
// Throw on an error with possibe recovery option
//
if (response.TransientFailure || response.PermanentFailure) {
if (status == FtpStatusCode.ServiceNotAvailable) {
MarkAsRecoverableFailure();
}
throw GenerateException(status,response.StatusDescription, null);
}
if (m_LoginState != FtpLoginState.LoggedIn
&& entry.Command.IndexOf("PASS") != -1)
{
// Note the fact that we logged in
if (status == FtpStatusCode.NeedLoginAccount || status == FtpStatusCode.LoggedInProceed)
m_LoginState = FtpLoginState.LoggedIn;
else
throw GenerateException(status,response.StatusDescription, null);
}
//
// Parse special cases
//
if (entry.HasFlag(PipelineEntryFlags.CreateDataConnection) && (response.PositiveCompletion || response.PositiveIntermediate))
{
bool isSocketReady;
PipelineInstruction result = QueueOrCreateDataConection(entry, response, timeout, ref stream, out isSocketReady);
if (!isSocketReady)
return result;
// otheriwse we have a stream to create
}
//
// This is part of the above case and it's all about giving data stream back
//
if (status == FtpStatusCode.OpeningData || status == FtpStatusCode.DataAlreadyOpen)
{
if (m_DataSocket == null)
{
// a better diagnostic?
return PipelineInstruction.Abort;
}
if (!entry.HasFlag(PipelineEntryFlags.GiveDataStream))
{
m_AbortReason = SR.GetString(SR.net_ftp_invalid_status_response, status, entry.Command);
return PipelineInstruction.Abort;
}
// Parse out the Content length, if we can
TryUpdateContentLength(response.StatusDescription);
// Parse out the file name, when it is returned and use it for our ResponseUri
if (status == FtpStatusCode.OpeningData)
{
FtpWebRequest request = (FtpWebRequest) m_Request;
if (request.MethodInfo.ShouldParseForResponseUri)
{
TryUpdateResponseUri(response.StatusDescription, request);
}
}
return QueueOrCreateFtpDataStream(ref stream);
}
//
// Parse responses by status code exclusivelly
//
//Update our command list if we have an alias
if (status == FtpStatusCode.LoggedInProceed)
{
if(StatusLine.ToLower(CultureInfo.InvariantCulture).IndexOf("alias") > 0){
//find start of alias
//skip first status code
int i = StatusLine.IndexOf("230-",3);
if(i > 0)
{
i+=4;
//eat white space
while(i<StatusLine.Length && StatusLine[i] == ' '){i++;}
//not eol
if (i <StatusLine.Length) {
//get end of alias
int j = StatusLine.IndexOf(' ',i);
if(j<0) j=StatusLine.Length;
m_Alias = StatusLine.Substring(i,j-i);
if (!m_IsRootPath) {
//update command list
for (i=0;i<m_Commands.Length;i++){
if(m_Commands[i].Command.IndexOf("CWD") == 0) {
string path = m_Alias+m_NewServerPath;
m_Commands[i] = new PipelineEntry(FormatFtpCommand("CWD", path));
break;
}
}
}
}
}
}
m_WelcomeMessage.Append(StatusLine);
}
// OR set the user response ExitMessage
else if (status == FtpStatusCode.ClosingControl)
{
m_ExitMessage.Append(response.StatusDescription);
// And close the control stream socket on "QUIT"
CloseSocket();
}
// OR parse out the file size or file time, usually a result of sending SIZE/MDTM commands
else if (status == FtpStatusCode.FileStatus)
{
FtpWebRequest request = (FtpWebRequest) m_Request;
if (entry.Command.StartsWith("SIZE ")) {
m_ContentLength = GetContentLengthFrom213Response(response.StatusDescription);
} else if (entry.Command.StartsWith("MDTM ")) {
m_LastModified = GetLastModifiedFrom213Response(response.StatusDescription);
}
}
// OR parse out our login directory
else if (status == FtpStatusCode.PathnameCreated)
{
if (entry.Command == "PWD\r\n" && !entry.HasFlag(PipelineEntryFlags.UserCommand))
{
m_LoginDirectory = GetLoginDirectory(response.StatusDescription);
if (!m_IsRootPath &&
m_LoginDirectory != "\\" &&
m_LoginDirectory != "/" &&
m_Alias == null)
{
//update command list
for (int i=0;i<m_Commands.Length;i++){
if(m_Commands[i].Command.IndexOf("CWD") == 0) {
string path = m_LoginDirectory+m_NewServerPath;
m_Commands[i] = new PipelineEntry(FormatFtpCommand("CWD", path));
break;
}
}
}
}
}
// Asserting we have some positive response
else
{
// OR update the current path (optimize this pls)
if (entry.Command.IndexOf("CWD") != -1)
{
m_PreviousServerPath = m_NewServerPath;
}
}
// Intermidate responses require rereading
if (response.PositiveIntermediate || (!UsingSecureStream && entry.Command == "AUTH TLS\r\n"))
{
return PipelineInstruction.Reread;
}
return PipelineInstruction.Advance;
}
private CommandStream.PipelineInstruction QueueOrCreateDataConection(CommandStream.PipelineEntry entry, ResponseDescription response, bool timeout, ref Stream stream, out bool isSocketReady)
{
CommandStream.PipelineInstruction instruction2;
isSocketReady = false;
if (this.m_DataHandshakeStarted)
{
isSocketReady = true;
return CommandStream.PipelineInstruction.Pause;
}
this.m_DataHandshakeStarted = true;
bool flag = false;
int port = -1;
if ((entry.Command == "PASV\r\n") || (entry.Command == "EPSV\r\n"))
{
if (!response.PositiveCompletion)
{
base.m_AbortReason = SR.GetString("net_ftp_server_failed_passive", new object[] { response.Status });
return CommandStream.PipelineInstruction.Abort;
}
if (entry.Command == "PASV\r\n")
{
port = this.GetPortV4(response.StatusDescription);
}
else
{
port = this.GetPortV6(response.StatusDescription);
}
flag = true;
}
new SocketPermission(PermissionState.Unrestricted).Assert();
try
{
CommandStream.PipelineInstruction pause;
if (flag)
{
try
{
this.m_DataSocket = this.CreateFtpDataSocket((FtpWebRequest) base.m_Request, base.Socket);
}
catch (ObjectDisposedException)
{
throw ExceptionHelper.RequestAbortedException;
}
this.m_PassiveEndPoint = new IPEndPoint(base.ServerAddress, port);
}
if (this.m_PassiveEndPoint != null)
{
IPEndPoint passiveEndPoint = this.m_PassiveEndPoint;
this.m_PassiveEndPoint = null;
if (base.m_Async)
{
this.m_DataSocket.BeginConnect(passiveEndPoint, m_ConnectCallbackDelegate, this);
pause = CommandStream.PipelineInstruction.Pause;
}
else
{
this.m_DataSocket.Connect(passiveEndPoint);
pause = CommandStream.PipelineInstruction.Advance;
}
}
else if (base.m_Async)
{
this.m_DataSocket.BeginAccept(m_AcceptCallbackDelegate, this);
pause = CommandStream.PipelineInstruction.Pause;
}
else
{
Socket dataSocket = this.m_DataSocket;
try
{
this.m_DataSocket = this.m_DataSocket.Accept();
if (!base.ServerAddress.Equals(((IPEndPoint) this.m_DataSocket.RemoteEndPoint).Address))
{
this.m_DataSocket.Close();
throw new WebException(SR.GetString("net_ftp_active_address_different"), WebExceptionStatus.ProtocolError);
}
isSocketReady = true;
pause = CommandStream.PipelineInstruction.Pause;
}
finally
{
dataSocket.Close();
}
}
instruction2 = pause;
}
finally
{
CodeAccessPermission.RevertAssert();
}
return instruction2;
}
protected override CommandStream.PipelineInstruction PipelineCallback(CommandStream.PipelineEntry entry, ResponseDescription response, bool timeout, ref Stream stream)
{
if (response == null)
{
return CommandStream.PipelineInstruction.Abort;
}
FtpStatusCode status = (FtpStatusCode) response.Status;
if (status != FtpStatusCode.ClosingControl)
{
this.StatusCode = status;
this.StatusLine = response.StatusDescription;
}
if (response.InvalidStatusCode)
{
throw new WebException(SR.GetString("net_InvalidStatusCode"), WebExceptionStatus.ProtocolError);
}
if (base.m_Index == -1)
{
switch (status)
{
case FtpStatusCode.SendUserCommand:
this.m_BannerMessage = new StringBuilder();
this.m_BannerMessage.Append(this.StatusLine);
return CommandStream.PipelineInstruction.Advance;
case FtpStatusCode.ServiceTemporarilyNotAvailable:
return CommandStream.PipelineInstruction.Reread;
}
throw base.GenerateException(status, response.StatusDescription, null);
}
if (entry.Command == "OPTS utf8 on\r\n")
{
if (response.PositiveCompletion)
{
base.Encoding = Encoding.UTF8;
}
else
{
base.Encoding = Encoding.Default;
}
return CommandStream.PipelineInstruction.Advance;
}
if (entry.Command.IndexOf("USER") != -1)
{
if (status == FtpStatusCode.LoggedInProceed)
{
this.m_LoginState = FtpLoginState.LoggedIn;
base.m_Index++;
}
else if ((status == FtpStatusCode.NotLoggedIn) && (this.m_LoginState != FtpLoginState.NotLoggedIn))
{
this.m_LoginState = FtpLoginState.ReloginFailed;
throw ExceptionHelper.IsolatedException;
}
}
if (response.TransientFailure || response.PermanentFailure)
{
if (status == FtpStatusCode.ServiceNotAvailable)
{
base.MarkAsRecoverableFailure();
}
throw base.GenerateException(status, response.StatusDescription, null);
}
if ((this.m_LoginState != FtpLoginState.LoggedIn) && (entry.Command.IndexOf("PASS") != -1))
{
switch (status)
{
case FtpStatusCode.NeedLoginAccount:
case FtpStatusCode.LoggedInProceed:
this.m_LoginState = FtpLoginState.LoggedIn;
goto Label_017A;
}
throw base.GenerateException(status, response.StatusDescription, null);
}
Label_017A:
if (entry.HasFlag(CommandStream.PipelineEntryFlags.CreateDataConnection) && (response.PositiveCompletion || response.PositiveIntermediate))
{
bool flag;
CommandStream.PipelineInstruction instruction = this.QueueOrCreateDataConection(entry, response, timeout, ref stream, out flag);
if (!flag)
{
return instruction;
}
}
switch (status)
{
case FtpStatusCode.OpeningData:
case FtpStatusCode.DataAlreadyOpen:
{
if (this.m_DataSocket == null)
{
return CommandStream.PipelineInstruction.Abort;
}
if (!entry.HasFlag(CommandStream.PipelineEntryFlags.GiveDataStream))
{
base.m_AbortReason = SR.GetString("net_ftp_invalid_status_response", new object[] { status, entry.Command });
return CommandStream.PipelineInstruction.Abort;
}
this.TryUpdateContentLength(response.StatusDescription);
FtpWebRequest request = (FtpWebRequest) base.m_Request;
if (request.MethodInfo.ShouldParseForResponseUri)
{
this.TryUpdateResponseUri(response.StatusDescription, request);
}
return this.QueueOrCreateFtpDataStream(ref stream);
}
case FtpStatusCode.LoggedInProceed:
this.m_WelcomeMessage.Append(this.StatusLine);
break;
case FtpStatusCode.ClosingControl:
this.m_ExitMessage.Append(response.StatusDescription);
base.CloseSocket();
break;
case FtpStatusCode.ServerWantsSecureSession:
{
FtpWebRequest initiatingRequest = (FtpWebRequest) base.m_Request;
TlsStream stream2 = new TlsStream(initiatingRequest.RequestUri.Host, base.NetworkStream, initiatingRequest.ClientCertificates, base.Pool.ServicePoint, initiatingRequest, base.m_Async ? initiatingRequest.GetWritingContext().ContextCopy : null);
base.NetworkStream = stream2;
break;
}
case FtpStatusCode.FileStatus:
{
FtpWebRequest request1 = (FtpWebRequest) base.m_Request;
if (entry.Command.StartsWith("SIZE "))
{
this.m_ContentLength = this.GetContentLengthFrom213Response(response.StatusDescription);
}
else if (entry.Command.StartsWith("MDTM "))
{
this.m_LastModified = this.GetLastModifiedFrom213Response(response.StatusDescription);
}
break;
}
default:
if (status == FtpStatusCode.PathnameCreated)
{
if ((entry.Command == "PWD\r\n") && !entry.HasFlag(CommandStream.PipelineEntryFlags.UserCommand))
{
this.m_LoginDirectory = this.GetLoginDirectory(response.StatusDescription);
}
}
else if (entry.Command.IndexOf("CWD") != -1)
{
this.m_EstablishedServerDirectory = this.m_RequestedServerDirectory;
}
break;
}
if (!response.PositiveIntermediate && (base.UsingSecureStream || !(entry.Command == "AUTH TLS\r\n")))
{
return CommandStream.PipelineInstruction.Advance;
}
return CommandStream.PipelineInstruction.Reread;
}
/// <summary>
/// ReceiveCommandResponseCallback is the main "while loop" of the ReceiveCommandResponse function family.
/// In general, what is does is perform an EndReceive() to complete the previous retrieval of bytes from the
/// server (unless it is using a buffered response) It then processes what is received by using the
/// implementing class's CheckValid() function, as described above. If the response is complete, it returns the single complete
/// response in the GeneralResponseDescription created in BeginReceiveComamndResponse, and buffers the rest as described above.
///
/// If the resposne is not complete, it issues another Connection.BeginReceive, with callback ReceiveCommandResponse2,
/// so the action will continue at the next invocation of ReceiveCommandResponse2.
/// </summary>
/// <param name="asyncResult"></param>
///
private void ReceiveCommandResponseCallback(ReceiveState state, int bytesRead)
{
// completeLength will be set to a nonnegative number by CheckValid if the response is complete:
// it will set completeLength to the length of a complete response.
int completeLength = -1;
while (true)
{
int validThrough = state.ValidThrough; // passed to checkvalid
// If we have a Buffered response (ie data was received with the last response that was past the end of that response)
// deal with it as if we had just received it now instead of actually doing another receive
if (m_Buffer.Length > 0)
{
// Append the string we got from the buffer, and flush it out.
state.Resp.StatusBuffer.Append(m_Buffer);
m_Buffer = string.Empty;
// invoke checkvalid.
if (!CheckValid(state.Resp, ref validThrough, ref completeLength))
{
throw GenerateException(WebExceptionStatus.ServerProtocolViolation, null);
}
}
else // we did a Connection.BeginReceive. Note that in this case, all bytes received are in the receive buffer (because bytes from
// the buffer were transferred there if necessary
{
// this indicates the connection was closed.
if (bytesRead <= 0)
{
throw GenerateException(WebExceptionStatus.ServerProtocolViolation, null);
}
// decode the bytes in the receive buffer into a string, append it to the statusbuffer, and invoke checkvalid.
// Decoder automatically takes care of caching partial codepoints at the end of a buffer.
char[] chars = new char[m_Decoder.GetCharCount(state.Buffer, 0, bytesRead)];
int numChars = m_Decoder.GetChars(state.Buffer, 0, bytesRead, chars, 0, false);
string szResponse = new string(chars, 0, numChars);
state.Resp.StatusBuffer.Append(szResponse);
if (!CheckValid(state.Resp, ref validThrough, ref completeLength))
{
throw GenerateException(WebExceptionStatus.ServerProtocolViolation, null);
}
// If the response is complete, then determine how many characters are left over...these bytes need to be set into Buffer.
if (completeLength >= 0)
{
int unusedChars = state.Resp.StatusBuffer.Length - completeLength;
if (unusedChars > 0)
{
m_Buffer = szResponse.Substring(szResponse.Length - unusedChars, unusedChars);
}
}
}
// Now, in general, if the response is not complete, update the "valid through" length for the efficiency of checkValid.
// and perform the next receive.
// Note that there may NOT be bytes in the beginning of the receive buffer (even if there were partial characters left over after the
// last encoding), because they get tracked in the Decoder.
if (completeLength < 0)
{
state.ValidThrough = validThrough;
try {
if (m_Async)
{
BeginRead(state.Buffer, 0, state.Buffer.Length, m_ReadCallbackDelegate, state);
return;
}
else
{
bytesRead = Read(state.Buffer, 0, state.Buffer.Length);
if (bytesRead == 0)
{
CloseSocket();
}
continue;
}
}
catch (IOException) {
MarkAsRecoverableFailure();
throw;
}
catch {
throw;
}
}
// the response is completed
break;
}
// Otherwise, we have a complete response.
string responseString = state.Resp.StatusBuffer.ToString();
state.Resp.StatusDescription = responseString.Substring(0, completeLength);
// set the StatusDescription to the complete part of the response. Note that the Buffer has already been taken care of above.
if (Logging.On)
{
Logging.PrintInfo(Logging.Web, this, SR.GetString(SR.net_log_received_response, responseString.Substring(0, completeLength - 2)));
}
if (m_Async)
{
// Tell who is listening what was received.
if (state.Resp != null)
{
m_CurrentResponseDescription = state.Resp;
}
Stream stream = null;
if (PostReadCommandProcessing(ref stream))
{
return;
}
ContinueCommandPipeline();
}
}
protected void InitCommandPipeline(WebRequest request, PipelineEntry [] commands, bool async) {
m_Commands = commands;
m_Index = 0;
m_Request = request;
m_Aborted = false;
m_DoRead = true;
m_DoSend = true;
m_CurrentResponseDescription = null;
m_Async = async;
m_RecoverableFailure = false;
m_AbortReason = string.Empty;
}
private bool PostSendCommandProcessing(ref Stream stream)
{
if (this.m_DoRead)
{
bool async = this.m_Async;
int index = this.m_Index;
PipelineEntry[] commands = this.m_Commands;
try
{
ResponseDescription description = this.ReceiveCommandResponse();
if (async)
{
return true;
}
this.m_CurrentResponseDescription = description;
}
catch
{
if (((index < 0) || (index >= commands.Length)) || (commands[index].Command != "QUIT\r\n"))
{
throw;
}
}
}
return this.PostReadCommandProcessing(ref stream);
}
protected override bool CheckValid(ResponseDescription response, ref int validThrough, ref int completeLength)
{
if (NetEventSource.IsEnabled) NetEventSource.Info(this, $"CheckValid({response.StatusBuffer})");
// If the response is less than 4 bytes long, it is too short to tell, so return true, valid so far.
if (response.StatusBuffer.Length < 4)
{
return true;
}
string responseString = response.StatusBuffer.ToString();
// Otherwise, if there is no status code for this response yet, get one.
if (response.Status == ResponseDescription.NoStatus)
{
// If the response does not start with three digits, then it is not a valid response from an FTP server.
if (!(Char.IsDigit(responseString[0]) && Char.IsDigit(responseString[1]) && Char.IsDigit(responseString[2]) && (responseString[3] == ' ' || responseString[3] == '-')))
{
return false;
}
else
{
response.StatusCodeString = responseString.Substring(0, 3);
response.Status = Convert.ToInt16(response.StatusCodeString, NumberFormatInfo.InvariantInfo);
}
// IF a hyphen follows the status code on the first line of the response, then we have a multiline response coming.
if (responseString[3] == '-')
{
response.Multiline = true;
}
}
// If a complete line of response has been received from the server, then see if the
// overall response is complete.
// If this was not a multiline response, then the response is complete at the end of the line.
// If this was a multiline response (indicated by three digits followed by a '-' in the first line),
// then we see if the last line received started with the same three digits followed by a space.
// If it did, then this is the sign of a complete multiline response.
// If the line contained three other digits followed by the response, then this is a violation of the
// FTP protocol for multiline responses.
// All other cases indicate that the response is not yet complete.
int index = 0;
while ((index = responseString.IndexOf("\r\n", validThrough)) != -1) // gets the end line.
{
int lineStart = validThrough;
validThrough = index + 2; // validThrough now marks the end of the line being examined.
if (!response.Multiline)
{
completeLength = validThrough;
return true;
}
if (responseString.Length > lineStart + 4)
{
// If the first three characters of the the response line currently being examined
// match the status code, then if they are followed by a space, then we
// have reached the end of the reply.
if (responseString.Substring(lineStart, 3) == response.StatusCodeString)
{
if (responseString[lineStart + 3] == ' ')
{
completeLength = validThrough;
return true;
}
}
}
}
return true;
}
private void ReceiveCommandResponseCallback(ReceiveState state, int bytesRead)
{
int num2;
int completeLength = -1;
Label_0002:
num2 = state.ValidThrough;
if (this.m_Buffer.Length > 0)
{
state.Resp.StatusBuffer.Append(this.m_Buffer);
this.m_Buffer = string.Empty;
if (!this.CheckValid(state.Resp, ref num2, ref completeLength))
{
throw this.GenerateException(WebExceptionStatus.ServerProtocolViolation, null);
}
}
else
{
if (bytesRead <= 0)
{
throw this.GenerateException(WebExceptionStatus.ServerProtocolViolation, null);
}
char[] chars = new char[this.m_Decoder.GetCharCount(state.Buffer, 0, bytesRead)];
int length = this.m_Decoder.GetChars(state.Buffer, 0, bytesRead, chars, 0, false);
string str = new string(chars, 0, length);
state.Resp.StatusBuffer.Append(str);
if (!this.CheckValid(state.Resp, ref num2, ref completeLength))
{
throw this.GenerateException(WebExceptionStatus.ServerProtocolViolation, null);
}
if (completeLength >= 0)
{
int num4 = state.Resp.StatusBuffer.Length - completeLength;
if (num4 > 0)
{
this.m_Buffer = str.Substring(str.Length - num4, num4);
}
}
}
if (completeLength < 0)
{
state.ValidThrough = num2;
try
{
if (this.m_Async)
{
this.BeginRead(state.Buffer, 0, state.Buffer.Length, m_ReadCallbackDelegate, state);
return;
}
bytesRead = this.Read(state.Buffer, 0, state.Buffer.Length);
if (bytesRead == 0)
{
base.CloseSocket();
}
goto Label_0002;
}
catch (IOException)
{
this.MarkAsRecoverableFailure();
throw;
}
catch
{
throw;
}
}
string str2 = state.Resp.StatusBuffer.ToString();
state.Resp.StatusDescription = str2.Substring(0, completeLength);
if (Logging.On)
{
Logging.PrintInfo(Logging.Web, this, SR.GetString("net_log_received_response", new object[] { str2.Substring(0, completeLength - 2) }));
}
if (this.m_Async)
{
if (state.Resp != null)
{
this.m_CurrentResponseDescription = state.Resp;
}
Stream stream = null;
if (!this.PostReadCommandProcessing(ref stream))
{
this.ContinueCommandPipeline();
}
}
}
private PipelineInstruction QueueOrCreateDataConection(PipelineEntry entry, ResponseDescription response, bool timeout, ref Stream stream, out bool isSocketReady)
{
isSocketReady = false;
if (_dataHandshakeStarted)
{
isSocketReady = true;
return PipelineInstruction.Pause; //if we already started then this is re-entering into the callback where we proceed with the stream
}
_dataHandshakeStarted = true;
// Handle passive responses by parsing the port and later doing a Connect(...)
bool isPassive = false;
int port = -1;
if (entry.Command == "PASV\r\n" || entry.Command == "EPSV\r\n")
{
if (!response.PositiveCompletion)
{
_abortReason = SR.Format(SR.net_ftp_server_failed_passive, response.Status);
return PipelineInstruction.Abort;
}
if (entry.Command == "PASV\r\n")
{
port = GetPortV4(response.StatusDescription);
}
else
{
port = GetPortV6(response.StatusDescription);
}
isPassive = true;
}
if (isPassive)
{
if (port == -1)
{
NetEventSource.Fail(this, "'port' not set.");
}
try
{
_dataSocket = CreateFtpDataSocket((FtpWebRequest)_request, Socket);
}
catch (ObjectDisposedException)
{
throw ExceptionHelper.RequestAbortedException;
}
IPEndPoint localEndPoint = new IPEndPoint(((IPEndPoint)Socket.LocalEndPoint).Address, 0);
_dataSocket.Bind(localEndPoint);
_passiveEndPoint = new IPEndPoint(ServerAddress, port);
}
PipelineInstruction result;
if (_passiveEndPoint != null)
{
IPEndPoint passiveEndPoint = _passiveEndPoint;
_passiveEndPoint = null;
if (NetEventSource.IsEnabled) NetEventSource.Info(this, "starting Connect()");
if (_isAsync)
{
_dataSocket.BeginConnect(passiveEndPoint, s_connectCallbackDelegate, this);
result = PipelineInstruction.Pause;
}
else
{
_dataSocket.Connect(passiveEndPoint);
result = PipelineInstruction.Advance; // for passive mode we end up going to the next command
}
}
else
{
if (NetEventSource.IsEnabled) NetEventSource.Info(this, "starting Accept()");
if (_isAsync)
{
_dataSocket.BeginAccept(s_acceptCallbackDelegate, this);
result = PipelineInstruction.Pause;
}
else
{
Socket listenSocket = _dataSocket;
try
{
_dataSocket = _dataSocket.Accept();
if (!ServerAddress.Equals(((IPEndPoint)_dataSocket.RemoteEndPoint).Address))
{
_dataSocket.Close();
throw new WebException(SR.net_ftp_active_address_different, WebExceptionStatus.ProtocolError);
}
isSocketReady = true; // for active mode we end up creating a stream before advancing the pipeline
result = PipelineInstruction.Pause;
}
finally
{
listenSocket.Close();
}
}
}
return result;
}
private bool PostReadCommandProcessing(ref Stream stream)
{
if (this.m_Index < this.m_Commands.Length)
{
PipelineInstruction advance;
PipelineEntry entry;
this.m_DoSend = false;
this.m_DoRead = false;
if (this.m_Index == -1)
{
entry = null;
}
else
{
entry = this.m_Commands[this.m_Index];
}
if ((this.m_CurrentResponseDescription == null) && (entry.Command == "QUIT\r\n"))
{
advance = PipelineInstruction.Advance;
}
else
{
advance = this.PipelineCallback(entry, this.m_CurrentResponseDescription, false, ref stream);
}
switch (advance)
{
case PipelineInstruction.Advance:
this.m_CurrentResponseDescription = null;
this.m_DoSend = true;
this.m_DoRead = true;
this.m_Index++;
break;
case PipelineInstruction.Pause:
return(true);
case PipelineInstruction.Abort:
Exception exception;
if (this.m_AbortReason != string.Empty)
{
exception = new WebException(this.m_AbortReason);
}
else
{
exception = this.GenerateException(WebExceptionStatus.ServerProtocolViolation, null);
}
this.Abort(exception);
throw exception;
case PipelineInstruction.GiveStream:
this.m_CurrentResponseDescription = null;
this.m_DoRead = true;
if (this.m_Async)
{
this.ContinueCommandPipeline();
this.InvokeRequestCallback(stream);
}
return(true);
case PipelineInstruction.Reread:
this.m_CurrentResponseDescription = null;
this.m_DoRead = true;
break;
}
}
return(false);
}
private bool PostSendCommandProcessing(ref Stream stream)
{
if (_doRead)
{
// In async case, the next call can actually result in a
// series of synchronous completions that eventually close
// the connection. So we need to save the members that
// we need to access, since they may not be valid after the
// next call returns
bool isAsync = _isAsync;
int index = _index;
PipelineEntry[] commands = _commands;
try
{
ResponseDescription response = ReceiveCommandResponse();
if (isAsync)
{
return true;
}
_currentResponseDescription = response;
}
catch
{
// If we get an exception on the QUIT command (which is
// always the last command), ignore the final exception
// and continue with the pipeline regardlss of sync/async
if (index < 0 || index >= commands.Length ||
commands[index].Command != "QUIT\r\n")
throw;
}
}
return PostReadCommandProcessing(ref stream);
}
internal ReceiveState(CommandStream connection)
{
Connection = connection;
Resp = new ResponseDescription();
Buffer = new byte[bufferSize]; //1024
ValidThrough = 0;
}
protected virtual PipelineInstruction PipelineCallback(PipelineEntry entry, ResponseDescription response, bool timeout, ref Stream stream)
{
return PipelineInstruction.Abort;
}
// This is called by underlying base class code, each time a new response is received from the wire or a protocol stage is resumed.
// This function controls the setting up of a data socket/connection, and of saving off the server responses.
protected override PipelineInstruction PipelineCallback(PipelineEntry entry, ResponseDescription response, bool timeout, ref Stream stream)
{
if (NetEventSource.IsEnabled)
{
NetEventSource.Info(this, $"Command:{entry?.Command} Description:{response?.StatusDescription}");
}
// null response is not expected
if (response == null)
{
return(PipelineInstruction.Abort);
}
FtpStatusCode status = (FtpStatusCode)response.Status;
//
// Update global "current status" for FtpWebRequest
//
if (status != FtpStatusCode.ClosingControl)
{
// A 221 status won't be reflected on the user FTP response
// Anything else will (by design?)
StatusCode = status;
StatusLine = response.StatusDescription;
}
// If the status code is outside the range defined in RFC (1xx to 5xx) throw
if (response.InvalidStatusCode)
{
throw new WebException(SR.net_InvalidStatusCode, WebExceptionStatus.ProtocolError);
}
// Update the banner message if any, this is a little hack because the "entry" param is null
if (_index == -1)
{
if (status == FtpStatusCode.SendUserCommand)
{
_bannerMessage = new StringBuilder();
_bannerMessage.Append(StatusLine);
return(PipelineInstruction.Advance);
}
else if (status == FtpStatusCode.ServiceTemporarilyNotAvailable)
{
return(PipelineInstruction.Reread);
}
else
{
throw GenerateException(status, response.StatusDescription, null);
}
}
//
// Check for the result of our attempt to use UTF8
//
if (entry.Command == "OPTS utf8 on\r\n")
{
if (response.PositiveCompletion)
{
Encoding = Encoding.UTF8;
}
else
{
Encoding = Encoding.Default;
}
return(PipelineInstruction.Advance);
}
// If we are already logged in and the server returns 530 then
// the server does not support re-issuing a USER command,
// tear down the connection and start all over again
if (entry.Command.IndexOf("USER") != -1)
{
// The server may not require a password for this user, so bypass the password command
if (status == FtpStatusCode.LoggedInProceed)
{
_loginState = FtpLoginState.LoggedIn;
_index++;
}
}
//
// Throw on an error with possible recovery option
//
if (response.TransientFailure || response.PermanentFailure)
{
if (status == FtpStatusCode.ServiceNotAvailable)
{
MarkAsRecoverableFailure();
}
throw GenerateException(status, response.StatusDescription, null);
}
if (_loginState != FtpLoginState.LoggedIn &&
entry.Command.IndexOf("PASS") != -1)
{
// Note the fact that we logged in
if (status == FtpStatusCode.NeedLoginAccount || status == FtpStatusCode.LoggedInProceed)
{
_loginState = FtpLoginState.LoggedIn;
}
else
{
throw GenerateException(status, response.StatusDescription, null);
}
}
//
// Parse special cases
//
if (entry.HasFlag(PipelineEntryFlags.CreateDataConnection) && (response.PositiveCompletion || response.PositiveIntermediate))
{
bool isSocketReady;
PipelineInstruction result = QueueOrCreateDataConection(entry, response, timeout, ref stream, out isSocketReady);
if (!isSocketReady)
{
return(result);
}
// otherwise we have a stream to create
}
//
// This is part of the above case and it's all about giving data stream back
//
if (status == FtpStatusCode.OpeningData || status == FtpStatusCode.DataAlreadyOpen)
{
if (_dataSocket == null)
{
return(PipelineInstruction.Abort);
}
if (!entry.HasFlag(PipelineEntryFlags.GiveDataStream))
{
_abortReason = SR.Format(SR.net_ftp_invalid_status_response, status, entry.Command);
return(PipelineInstruction.Abort);
}
// Parse out the Content length, if we can
TryUpdateContentLength(response.StatusDescription);
// Parse out the file name, when it is returned and use it for our ResponseUri
FtpWebRequest request = (FtpWebRequest)_request;
if (request.MethodInfo.ShouldParseForResponseUri)
{
TryUpdateResponseUri(response.StatusDescription, request);
}
return(QueueOrCreateFtpDataStream(ref stream));
}
//
// Parse responses by status code exclusivelly
//
// Update welcome message
if (status == FtpStatusCode.LoggedInProceed)
{
_welcomeMessage.Append(StatusLine);
}
// OR set the user response ExitMessage
else if (status == FtpStatusCode.ClosingControl)
{
_exitMessage.Append(response.StatusDescription);
// And close the control stream socket on "QUIT"
CloseSocket();
}
// OR set us up for SSL/TLS, after this we'll be writing securely
else if (status == FtpStatusCode.ServerWantsSecureSession)
{
// If NetworkStream is a TlsStream, then this must be in the async callback
// from completing the SSL handshake.
// So just let the pipeline continue.
if (!(NetworkStream is TlsStream))
{
FtpWebRequest request = (FtpWebRequest)_request;
TlsStream tlsStream = new TlsStream(NetworkStream, Socket, request.RequestUri.Host, request.ClientCertificates);
if (_isAsync)
{
tlsStream.BeginAuthenticateAsClient(ar =>
{
try
{
tlsStream.EndAuthenticateAsClient(ar);
NetworkStream = tlsStream;
this.ContinueCommandPipeline();
}
catch (Exception e)
{
this.CloseSocket();
this.InvokeRequestCallback(e);
}
}, null);
return(PipelineInstruction.Pause);
}
else
{
tlsStream.AuthenticateAsClient();
NetworkStream = tlsStream;
}
}
}
// OR parse out the file size or file time, usually a result of sending SIZE/MDTM commands
else if (status == FtpStatusCode.FileStatus)
{
FtpWebRequest request = (FtpWebRequest)_request;
if (entry.Command.StartsWith("SIZE "))
{
_contentLength = GetContentLengthFrom213Response(response.StatusDescription);
}
else if (entry.Command.StartsWith("MDTM "))
{
_lastModified = GetLastModifiedFrom213Response(response.StatusDescription);
}
}
// OR parse out our login directory
else if (status == FtpStatusCode.PathnameCreated)
{
if (entry.Command == "PWD\r\n" && !entry.HasFlag(PipelineEntryFlags.UserCommand))
{
_loginDirectory = GetLoginDirectory(response.StatusDescription);
}
}
// Asserting we have some positive response
else
{
// We only use CWD to reset ourselves back to the login directory.
if (entry.Command.IndexOf("CWD") != -1)
{
_establishedServerDirectory = _requestedServerDirectory;
}
}
// Intermediate responses require rereading
if (response.PositiveIntermediate || (!UsingSecureStream && entry.Command == "AUTH TLS\r\n"))
{
return(PipelineInstruction.Reread);
}
return(PipelineInstruction.Advance);
}
/// <summary>
/// ReceiveCommandResponseCallback is the main "while loop" of the ReceiveCommandResponse function family.
/// In general, what is does is perform an EndReceive() to complete the previous retrieval of bytes from the
/// server (unless it is using a buffered response) It then processes what is received by using the
/// implementing class's CheckValid() function, as described above. If the response is complete, it returns the single complete
/// response in the GeneralResponseDescription created in BeginReceiveComamndResponse, and buffers the rest as described above.
///
/// If the response is not complete, it issues another Connection.BeginReceive, with callback ReceiveCommandResponse2,
/// so the action will continue at the next invocation of ReceiveCommandResponse2.
/// </summary>
private void ReceiveCommandResponseCallback(ReceiveState state, int bytesRead)
{
// completeLength will be set to a nonnegative number by CheckValid if the response is complete:
// it will set completeLength to the length of a complete response.
int completeLength = -1;
while (true)
{
int validThrough = state.ValidThrough; // passed to checkvalid
// If we have a Buffered response (ie data was received with the last response that was past the end of that response)
// deal with it as if we had just received it now instead of actually doing another receive
if (_buffer.Length > 0)
{
// Append the string we got from the buffer, and flush it out.
state.Resp.StatusBuffer.Append(_buffer);
_buffer = string.Empty;
// invoke checkvalid.
if (!CheckValid(state.Resp, ref validThrough, ref completeLength))
{
throw GenerateException(SR.net_ftp_protocolerror, WebExceptionStatus.ServerProtocolViolation, null);
}
}
else // we did a Connection.BeginReceive. Note that in this case, all bytes received are in the receive buffer (because bytes from
// the buffer were transferred there if necessary
{
// this indicates the connection was closed.
if (bytesRead <= 0)
{
throw GenerateException(SR.net_ftp_protocolerror, WebExceptionStatus.ServerProtocolViolation, null);
}
// decode the bytes in the receive buffer into a string, append it to the statusbuffer, and invoke checkvalid.
// Decoder automatically takes care of caching partial codepoints at the end of a buffer.
char[] chars = new char[_decoder.GetCharCount(state.Buffer, 0, bytesRead)];
int numChars = _decoder.GetChars(state.Buffer, 0, bytesRead, chars, 0, false);
string szResponse = new string(chars, 0, numChars);
state.Resp.StatusBuffer.Append(szResponse);
if (!CheckValid(state.Resp, ref validThrough, ref completeLength))
{
throw GenerateException(SR.net_ftp_protocolerror, WebExceptionStatus.ServerProtocolViolation, null);
}
// If the response is complete, then determine how many characters are left over...these bytes need to be set into Buffer.
if (completeLength >= 0)
{
int unusedChars = state.Resp.StatusBuffer.Length - completeLength;
if (unusedChars > 0)
{
_buffer = szResponse.Substring(szResponse.Length - unusedChars, unusedChars);
}
}
}
// Now, in general, if the response is not complete, update the "valid through" length for the efficiency of checkValid,
// and perform the next receive.
// Note that there may NOT be bytes in the beginning of the receive buffer (even if there were partial characters left over after the
// last encoding), because they get tracked in the Decoder.
if (completeLength < 0)
{
state.ValidThrough = validThrough;
try
{
if (_isAsync)
{
BeginRead(state.Buffer, 0, state.Buffer.Length, s_readCallbackDelegate, state);
return;
}
else
{
bytesRead = Read(state.Buffer, 0, state.Buffer.Length);
if (bytesRead == 0)
CloseSocket();
continue;
}
}
catch (IOException)
{
MarkAsRecoverableFailure();
throw;
}
catch
{
throw;
}
}
// The response is completed
break;
}
// Otherwise, we have a complete response.
string responseString = state.Resp.StatusBuffer.ToString();
state.Resp.StatusDescription = responseString.Substring(0, completeLength);
// Set the StatusDescription to the complete part of the response. Note that the Buffer has already been taken care of above.
if (NetEventSource.Log.IsEnabled())
NetEventSource.PrintInfo(NetEventSource.ComponentType.Web, this, string.Format("Received response: {0}", responseString.Substring(0, completeLength - 2)));
if (_isAsync)
{
// Tell who is listening what was received.
if (state.Resp != null)
{
_currentResponseDescription = state.Resp;
}
Stream stream = null;
if (PostReadCommandProcessing(ref stream))
return;
ContinueCommandPipeline();
}
}
private void ReceiveCommandResponseCallback(ReceiveState state, int bytesRead)
{
int num2;
int completeLength = -1;
Label_0002:
num2 = state.ValidThrough;
if (this.m_Buffer.Length > 0)
{
state.Resp.StatusBuffer.Append(this.m_Buffer);
this.m_Buffer = string.Empty;
if (!this.CheckValid(state.Resp, ref num2, ref completeLength))
{
throw this.GenerateException(WebExceptionStatus.ServerProtocolViolation, null);
}
}
else
{
if (bytesRead <= 0)
{
throw this.GenerateException(WebExceptionStatus.ServerProtocolViolation, null);
}
char[] chars = new char[this.m_Decoder.GetCharCount(state.Buffer, 0, bytesRead)];
int length = this.m_Decoder.GetChars(state.Buffer, 0, bytesRead, chars, 0, false);
string str = new string(chars, 0, length);
state.Resp.StatusBuffer.Append(str);
if (!this.CheckValid(state.Resp, ref num2, ref completeLength))
{
throw this.GenerateException(WebExceptionStatus.ServerProtocolViolation, null);
}
if (completeLength >= 0)
{
int num4 = state.Resp.StatusBuffer.Length - completeLength;
if (num4 > 0)
{
this.m_Buffer = str.Substring(str.Length - num4, num4);
}
}
}
if (completeLength < 0)
{
state.ValidThrough = num2;
try
{
if (this.m_Async)
{
this.BeginRead(state.Buffer, 0, state.Buffer.Length, m_ReadCallbackDelegate, state);
return;
}
bytesRead = this.Read(state.Buffer, 0, state.Buffer.Length);
if (bytesRead == 0)
{
base.CloseSocket();
}
goto Label_0002;
}
catch (IOException)
{
this.MarkAsRecoverableFailure();
throw;
}
catch
{
throw;
}
}
string str2 = state.Resp.StatusBuffer.ToString();
state.Resp.StatusDescription = str2.Substring(0, completeLength);
if (Logging.On)
{
Logging.PrintInfo(Logging.Web, this, SR.GetString("net_log_received_response", new object[] { str2.Substring(0, completeLength - 2) }));
}
if (this.m_Async)
{
if (state.Resp != null)
{
this.m_CurrentResponseDescription = state.Resp;
}
Stream stream = null;
if (!this.PostReadCommandProcessing(ref stream))
{
this.ContinueCommandPipeline();
}
}
}
protected override bool CheckValid(ResponseDescription response, ref int validThrough, ref int completeLength)
{
if (NetEventSource.IsEnabled)
{
NetEventSource.Info(this, $"CheckValid({response.StatusBuffer})");
}
// If the response is less than 4 bytes long, it is too short to tell, so return true, valid so far.
if (response.StatusBuffer.Length < 4)
{
return(true);
}
string responseString = response.StatusBuffer.ToString();
// Otherwise, if there is no status code for this response yet, get one.
if (response.Status == ResponseDescription.NoStatus)
{
// If the response does not start with three digits, then it is not a valid response from an FTP server.
if (!(char.IsDigit(responseString[0]) && char.IsDigit(responseString[1]) && char.IsDigit(responseString[2]) && (responseString[3] == ' ' || responseString[3] == '-')))
{
return(false);
}
else
{
response.StatusCodeString = responseString.Substring(0, 3);
response.Status = Convert.ToInt16(response.StatusCodeString, NumberFormatInfo.InvariantInfo);
}
// IF a hyphen follows the status code on the first line of the response, then we have a multiline response coming.
if (responseString[3] == '-')
{
response.Multiline = true;
}
}
// If a complete line of response has been received from the server, then see if the
// overall response is complete.
// If this was not a multiline response, then the response is complete at the end of the line.
// If this was a multiline response (indicated by three digits followed by a '-' in the first line),
// then we see if the last line received started with the same three digits followed by a space.
// If it did, then this is the sign of a complete multiline response.
// If the line contained three other digits followed by the response, then this is a violation of the
// FTP protocol for multiline responses.
// All other cases indicate that the response is not yet complete.
int index = 0;
while ((index = responseString.IndexOf("\r\n", validThrough)) != -1) // gets the end line.
{
int lineStart = validThrough;
validThrough = index + 2; // validThrough now marks the end of the line being examined.
if (!response.Multiline)
{
completeLength = validThrough;
return(true);
}
if (responseString.Length > lineStart + 4)
{
// If the first three characters of the response line currently being examined
// match the status code, then if they are followed by a space, then we
// have reached the end of the reply.
if (responseString.Substring(lineStart, 3) == response.StatusCodeString)
{
if (responseString[lineStart + 3] == ' ')
{
completeLength = validThrough;
return(true);
}
}
}
}
return(true);
}
//
private bool PostReadCommandProcessing(ref Stream stream)
{
if (m_Index >= m_Commands.Length)
{
return(false);
}
// Set up front to prevent a race condition on result == PipelineInstruction.Pause
m_DoSend = false;
m_DoRead = false;
PipelineInstruction result;
PipelineEntry entry;
if (m_Index == -1)
{
entry = null;
}
else
{
entry = m_Commands[m_Index];
}
// Final QUIT command may get exceptions since the connectin
// may be already closed by the server. So there is no response
// to process, just advance the pipeline to continue
if (m_CurrentResponseDescription == null && entry.Command == "QUIT\r\n")
{
result = PipelineInstruction.Advance;
}
else
{
result = PipelineCallback(entry, m_CurrentResponseDescription, false, ref stream);
}
if (result == PipelineInstruction.Abort)
{
Exception exception;
if (m_AbortReason != string.Empty)
{
exception = new WebException(m_AbortReason);
}
else
{
exception = GenerateException(WebExceptionStatus.ServerProtocolViolation, null);
}
Abort(exception);
throw exception;
}
else if (result == PipelineInstruction.Advance)
{
m_CurrentResponseDescription = null;
m_DoSend = true;
m_DoRead = true;
m_Index++;
}
else if (result == PipelineInstruction.Pause)
{
//
// PipelineCallback did an async operation and will have to re-enter again
// Hold on for now
//
return(true);
}
else if (result == PipelineInstruction.GiveStream)
{
//
// We will have another response coming, don't send
//
m_CurrentResponseDescription = null;
m_DoRead = true;
if (m_Async)
{
// If they block in the requestcallback we should still continue the pipeline
ContinueCommandPipeline();
InvokeRequestCallback(stream);
}
return(true);
}
else if (result == PipelineInstruction.Reread)
{
// Another response is expected after this one
m_CurrentResponseDescription = null;
m_DoRead = true;
}
return(false);
}
private PipelineInstruction QueueOrCreateDataConection(PipelineEntry entry, ResponseDescription response, bool timeout, ref Stream stream, out bool isSocketReady)
{
isSocketReady = false;
if (_dataHandshakeStarted)
{
isSocketReady = true;
return(PipelineInstruction.Pause); //if we already started then this is re-entering into the callback where we proceed with the stream
}
_dataHandshakeStarted = true;
// Handle passive responses by parsing the port and later doing a Connect(...)
bool isPassive = false;
int port = -1;
if (entry.Command == "PASV\r\n" || entry.Command == "EPSV\r\n")
{
if (!response.PositiveCompletion)
{
_abortReason = SR.Format(SR.net_ftp_server_failed_passive, response.Status);
return(PipelineInstruction.Abort);
}
if (entry.Command == "PASV\r\n")
{
port = GetPortV4(response.StatusDescription);
}
else
{
port = GetPortV6(response.StatusDescription);
}
isPassive = true;
}
if (isPassive)
{
if (port == -1)
{
NetEventSource.Fail(this, "'port' not set.");
}
try
{
_dataSocket = CreateFtpDataSocket((FtpWebRequest)_request, Socket);
}
catch (ObjectDisposedException)
{
throw ExceptionHelper.RequestAbortedException;
}
IPEndPoint localEndPoint = new IPEndPoint(((IPEndPoint)Socket.LocalEndPoint).Address, 0);
_dataSocket.Bind(localEndPoint);
_passiveEndPoint = new IPEndPoint(ServerAddress, port);
}
PipelineInstruction result;
if (_passiveEndPoint != null)
{
IPEndPoint passiveEndPoint = _passiveEndPoint;
_passiveEndPoint = null;
if (NetEventSource.IsEnabled)
{
NetEventSource.Info(this, "starting Connect()");
}
if (_isAsync)
{
_dataSocket.BeginConnect(passiveEndPoint, s_connectCallbackDelegate, this);
result = PipelineInstruction.Pause;
}
else
{
_dataSocket.Connect(passiveEndPoint);
result = PipelineInstruction.Advance; // for passive mode we end up going to the next command
}
}
else
{
if (NetEventSource.IsEnabled)
{
NetEventSource.Info(this, "starting Accept()");
}
if (_isAsync)
{
_dataSocket.BeginAccept(s_acceptCallbackDelegate, this);
result = PipelineInstruction.Pause;
}
else
{
Socket listenSocket = _dataSocket;
try
{
_dataSocket = _dataSocket.Accept();
if (!ServerAddress.Equals(((IPEndPoint)_dataSocket.RemoteEndPoint).Address))
{
_dataSocket.Close();
throw new WebException(SR.net_ftp_active_address_different, WebExceptionStatus.ProtocolError);
}
isSocketReady = true; // for active mode we end up creating a stream before advancing the pipeline
result = PipelineInstruction.Pause;
}
finally
{
listenSocket.Close();
}
}
}
return(result);
}
protected virtual PipelineInstruction PipelineCallback(PipelineEntry entry, ResponseDescription response, bool timeout, ref Stream stream)
{
return(PipelineInstruction.Abort);
}