void ProcessRequest()
{
if (State == RequestState.Scheduled)
{
ftpResponse = new FtpWebResponse(requestUri, method, keepAlive);
try {
ProcessMethod();
//State = RequestState.Finished;
//finalResponse = ftpResponse;
asyncResult.SetCompleted(false, ftpResponse);
}
catch (Exception e) {
State = RequestState.Error;
SetCompleteWithError(e);
}
}
else
{
if (InProgress())
{
FtpStatus status = GetResponseStatus();
ftpResponse.UpdateStatus(status);
if (ftpResponse.IsFinal())
{
State = RequestState.Finished;
}
}
asyncResult.SetCompleted(false, ftpResponse);
}
}
static string GetInitialPath(FtpStatus status)
{
int s = (int)status.StatusCode;
if (s < 200 || s > 300 || status.StatusDescription.Length <= 4)
{
throw new WebException("Error getting current directory: " + status.StatusDescription, null,
WebExceptionStatus.UnknownError, null);
}
string msg = status.StatusDescription.Substring(4);
if (msg [0] == '"')
{
int next_quote = msg.IndexOf('\"', 1);
if (next_quote == -1)
{
throw new WebException("Error getting current directory: PWD -> " + status.StatusDescription, null,
WebExceptionStatus.UnknownError, null);
}
msg = msg.Substring(1, next_quote - 1);
}
if (!msg.EndsWith("/"))
{
msg += "/";
}
return(msg);
}
FtpStatus SendCommand(bool waitResponse, string command, params string [] parameters)
{
byte [] cmd;
string commandString = command;
if (parameters.Length > 0)
{
commandString += " " + String.Join(" ", parameters);
}
commandString += EOL;
cmd = Encoding.ASCII.GetBytes(commandString);
try {
controlStream.Write(cmd, 0, cmd.Length);
} catch (IOException) {
//controlStream.Close ();
return(new FtpStatus(FtpStatusCode.ServiceNotAvailable, "Write failed"));
}
if (!waitResponse)
{
return(null);
}
FtpStatus result = GetResponseStatus();
if (ftpResponse != null)
{
ftpResponse.UpdateStatus(result);
}
return(result);
}
Exception CreateExceptionFromResponse(FtpStatus status)
{
FtpWebResponse ftpResponse = new FtpWebResponse(requestUri, method, status);
WebException exc = new WebException("Server returned an error: " + status.StatusDescription,
null, WebExceptionStatus.ProtocolError, ftpResponse);
return(exc);
}
void OpenControlConnection()
{
Exception exception = null;
Socket sock = null;
foreach (IPAddress address in hostEntry.AddressList)
{
sock = new Socket(address.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
IPEndPoint remote = new IPEndPoint(address, requestUri.Port);
if (!ServicePoint.CallEndPointDelegate(sock, remote))
{
sock.Close();
sock = null;
}
else
{
try {
sock.Connect(remote);
localEndPoint = (IPEndPoint)sock.LocalEndPoint;
break;
} catch (SocketException exc) {
exception = exc;
sock.Close();
sock = null;
}
}
}
// Couldn't connect to any address
if (sock == null)
{
throw new WebException("Unable to connect to remote server", exception,
WebExceptionStatus.UnknownError, ftpResponse);
}
controlStream = new NetworkStream(sock);
controlReader = new StreamReader(controlStream, Encoding.ASCII);
State = RequestState.Authenticating;
Authenticate();
FtpStatus status = SendCommand("OPTS", "utf8", "on");
if ((int)status.StatusCode < 200 || (int)status.StatusCode > 300)
{
dataEncoding = Encoding.Default;
}
else
{
dataEncoding = Encoding.UTF8;
}
status = SendCommand(WebRequestMethods.Ftp.PrintWorkingDirectory);
initial_path = GetInitialPath(status);
}
void SetType()
{
if (binary)
{
FtpStatus status = SendCommand(TypeCommand, DataType);
if ((int)status.StatusCode < 200 || (int)status.StatusCode >= 300)
{
throw CreateExceptionFromResponse(status);
}
}
}
private void InitiateSecureConnection(ref NetworkStream stream)
{
FtpStatus status = SendCommand(AuthCommand, "TLS");
if (status.StatusCode != FtpStatusCode.ServerWantsSecureSession)
{
throw CreateExceptionFromResponse(status);
}
ChangeToSSLSocket(ref stream);
}
// Here we could also get a server error, so be cautious
internal void SetTransferCompleted()
{
if (InFinalState())
{
return;
}
State = RequestState.Finished;
FtpStatus status = GetResponseStatus();
ftpResponse.UpdateStatus(status);
if (!keepAlive)
{
CloseConnection();
}
}
void DownloadData()
{
State = RequestState.OpeningData;
// Handle content offset
if (offset > 0)
{
FtpStatus status = SendCommand(RestCommand, offset.ToString());
if (status.StatusCode != FtpStatusCode.FileCommandPending)
{
throw CreateExceptionFromResponse(status);
}
}
OpenDataConnection();
State = RequestState.TransferInProgress;
ftpResponse.Stream = new FtpDataStream(this, dataSocket, true);
}
internal void UpdateStatus (FtpStatus status) {
statusCode = status.StatusCode;
statusDescription = status.StatusDescription;
}
void Authenticate()
{
string username = null;
string password = null;
string domain = null;
if (credentials != null)
{
username = credentials.UserName;
password = credentials.Password;
domain = credentials.Domain;
}
if (username == null)
{
username = "******";
}
if (password == null)
{
password = "******";
}
if (!string.IsNullOrEmpty(domain))
{
username = domain + '\\' + username;
}
// Connect to server and get banner message
FtpStatus status = GetResponseStatus();
ftpResponse.BannerMessage = status.StatusDescription;
if (EnableSsl)
{
InitiateSecureConnection(ref controlStream);
controlReader = new StreamReader(controlStream, Encoding.ASCII);
}
if (status.StatusCode != FtpStatusCode.SendUserCommand)
{
throw CreateExceptionFromResponse(status);
}
status = SendCommand(UserCommand, username);
switch (status.StatusCode)
{
case FtpStatusCode.SendPasswordCommand:
status = SendCommand(PasswordCommand, password);
if (status.StatusCode != FtpStatusCode.LoggedInProceed)
{
throw CreateExceptionFromResponse(status);
}
break;
case FtpStatusCode.LoggedInProceed:
break;
default:
throw CreateExceptionFromResponse(status);
}
ftpResponse.WelcomeMessage = status.StatusDescription;
ftpResponse.UpdateStatus(status);
}
internal FtpWebResponse(FtpWebRequest request, Uri uri, string method, FtpStatus status) :
this(request, uri, method, status.StatusCode, status.StatusDescription)
{
}
internal void UpdateStatus(FtpStatus status)
{
statusCode = status.StatusCode;
statusDescription = status.StatusDescription;
}
internal FtpWebResponse (FtpWebRequest request, Uri uri, string method, FtpStatus status) :
this (request, uri, method, status.StatusCode, status.StatusDescription)
{
}
Exception CreateExceptionFromResponse (FtpStatus status)
{
FtpWebResponse ftpResponse = new FtpWebResponse (this, requestUri, method, status);
WebException exc = new WebException ("Server returned an error: " + status.StatusDescription,
null, WebExceptionStatus.ProtocolError, ftpResponse);
return exc;
}
static string GetInitialPath (FtpStatus status)
{
int s = (int) status.StatusCode;
if (s < 200 || s > 300 || status.StatusDescription.Length <= 4)
throw new WebException ("Error getting current directory: " + status.StatusDescription, null,
WebExceptionStatus.UnknownError, null);
string msg = status.StatusDescription.Substring (4);
if (msg [0] == '"') {
int next_quote = msg.IndexOf ('\"', 1);
if (next_quote == -1)
throw new WebException ("Error getting current directory: PWD -> " + status.StatusDescription, null,
WebExceptionStatus.UnknownError, null);
msg = msg.Substring (1, next_quote - 1);
}
if (!msg.EndsWith ("/"))
msg += "/";
return msg;
}
void Authenticate ()
{
string username = null;
string password = null;
string domain = null;
if (credentials != null) {
username = credentials.UserName;
password = credentials.Password;
domain = credentials.Domain;
}
if (username == null)
username = "******";
if (password == null)
password = "******";
if (!string.IsNullOrEmpty (domain))
username = domain + '\\' + username;
// Connect to server and get banner message
FtpStatus status = GetResponseStatus ();
ftpResponse.BannerMessage = status.StatusDescription;
if (EnableSsl) {
InitiateSecureConnection (ref controlStream);
controlReader = new StreamReader (controlStream, Encoding.ASCII);
status = SendCommand ("PBSZ", "0");
int st = (int) status.StatusCode;
if (st < 200 || st >= 300)
throw CreateExceptionFromResponse (status);
// TODO: what if "PROT P" is denied by the server? What does MS do?
status = SendCommand ("PROT", "P");
st = (int) status.StatusCode;
if (st < 200 || st >= 300)
throw CreateExceptionFromResponse (status);
status = new FtpStatus (FtpStatusCode.SendUserCommand, "");
}
if (status.StatusCode != FtpStatusCode.SendUserCommand)
throw CreateExceptionFromResponse (status);
status = SendCommand (UserCommand, username);
switch (status.StatusCode) {
case FtpStatusCode.SendPasswordCommand:
status = SendCommand (PasswordCommand, password);
if (status.StatusCode != FtpStatusCode.LoggedInProceed)
throw CreateExceptionFromResponse (status);
break;
case FtpStatusCode.LoggedInProceed:
break;
default:
throw CreateExceptionFromResponse (status);
}
ftpResponse.WelcomeMessage = status.StatusDescription;
ftpResponse.UpdateStatus (status);
}
