private async Task ProcessCommandAsync(string message)
{
var messageSegs = message.Split(new[] { ' ' }, 2);
var command = messageSegs[0];
var parameter = messageSegs.Length < 2 ? string.Empty : messageSegs[1];
server.Tracer.TraceCommand(command, remoteEndPoint);
switch (command.ToUpper())
{
case "RNFR":
if (!authenticated)
{
await ReplyAsync(FtpReplyCode.NotLoggedIn, "You need to log in first");
return;
}
await CommandRnfrAsync(parameter);
return;
case "RNTO":
if (!authenticated)
{
await ReplyAsync(FtpReplyCode.NotLoggedIn, "You need to log in first");
return;
}
await ReplyAsync(FtpReplyCode.BadSequence, "Should use RNFR first");
return;
case "DELE":
if (!authenticated)
{
await ReplyAsync(FtpReplyCode.NotLoggedIn, "You need to log in first");
return;
}
await fileProvider.DeleteAsync(parameter);
await ReplyAsync(FtpReplyCode.FileActionOk, "Delete succeeded");
return;
case "RMD":
if (!authenticated)
{
await ReplyAsync(FtpReplyCode.NotLoggedIn, "You need to log in first");
return;
}
await fileProvider.DeleteDirectoryAsync(parameter);
await ReplyAsync(FtpReplyCode.FileActionOk, "Directory deleted");
return;
case "MKD":
if (!authenticated)
{
await ReplyAsync(FtpReplyCode.NotLoggedIn, "You need to log in first");
return;
}
await fileProvider.CreateDirectoryAsync(parameter);
await ReplyAsync(
FtpReplyCode.PathCreated,
string.Format(
"\"{0}\"",
fileProvider.GetWorkingDirectory().Replace("\"", "\"\"")));
return;
case "PWD":
if (!authenticated)
{
await ReplyAsync(FtpReplyCode.NotLoggedIn, "You need to log in first");
return;
}
await ReplyAsync(
FtpReplyCode.PathCreated,
string.Format(
"\"{0}\"",
fileProvider.GetWorkingDirectory().Replace("\"", "\"\"")));
return;
case "SYST":
await ReplyAsync(FtpReplyCode.NameSystemType, "UNIX simulated by .NET Core");
return;
case "FEAT":
await ReplyMultilineAsync(FtpReplyCode.SystemStatus, "Supports:\nUTF8");
return;
case "OPTS":
if (parameter.ToLowerInvariant() == "UTF8 ON")
{
encoding = Encoding.UTF8;
await ReplyAsync(FtpReplyCode.CommandOkay, "UTF-8 is on");
return;
}
else if (parameter.ToUpper() == "UTF8 OFF")
{
encoding = Encoding.ASCII;
await ReplyAsync(FtpReplyCode.CommandOkay, "UTF-8 is off");
return;
}
break;
case "USER":
userName = parameter;
authenticated = false;
fileProvider = null;
await ReplyAsync(FtpReplyCode.NeedPassword, "Please input password");
return;
case "PASS":
if (authenticated = server.Authenticator.Authenticate(userName, parameter))
{
await ReplyAsync(FtpReplyCode.UserLoggedIn, "Logged in");
fileProvider = server.FileManager.GetProvider(userName);
}
else
{
await ReplyAsync(FtpReplyCode.NotLoggedIn, "Failed to log in");
fileProvider = null;
}
return;
case "PORT":
await CommandPortAsync(parameter);
return;
case "EPRT":
await CommandEprtAsync(parameter);
return;
case "PASV":
await CommandPasvAsync();
return;
case "EPSV":
await CommandEpsvAsync(parameter);
return;
case "TYPE":
switch (parameter)
{
case "A":
dataType = DataType.ASCII;
await ReplyAsync(FtpReplyCode.CommandOkay, "In ASCII type");
return;
case "I":
dataType = DataType.IMAGE;
await ReplyAsync(FtpReplyCode.CommandOkay, "In IMAGE type");
return;
default:
await ReplyAsync(FtpReplyCode.ParameterNotImplemented, "Unknown type");
return;
}
case "MODE":
if (parameter == "S")
{
transmissionMode = TransmissionMode.Stream;
await ReplyAsync(FtpReplyCode.CommandOkay, "In stream mode");
}
else
{
await ReplyAsync(FtpReplyCode.ParameterNotImplemented, "Unknown mode");
}
return;
case "QUIT":
if (server.ControlConnectionSslFactory != null)
{
await server.ControlConnectionSslFactory.DisconnectAsync(stream);
}
throw new QuitRequestedException();
case "RETR":
await CommandRetrAsync(parameter);
return;
case "STOR":
await CommandStorAsync(parameter);
return;
case "CWD":
if (!authenticated)
{
await ReplyAsync(FtpReplyCode.NotLoggedIn, "You need to log in first");
return;
}
if (fileProvider.SetWorkingDirectory(parameter))
{
await ReplyAsync(FtpReplyCode.FileActionOk, fileProvider.GetWorkingDirectory());
}
else
{
await ReplyAsync(FtpReplyCode.FileNoAccess, "Path doesn't exist");
}
return;
case "NLST":
await CommandNlstAsync(parameter);
return;
case "LIST":
await CommandListAsync(parameter);
return;
case "NOOP":
await ReplyAsync(FtpReplyCode.CommandOkay, "OK");
return;
case "AUTH":
await CommandAuthAsync(parameter);
return;
case "PROT":
await CommandProtAsync(parameter);
return;
}
await ReplyAsync(FtpReplyCode.CommandUnrecognized, "Can't recognize this command.");
}
