private async Task CommandEpsvAsync(string parameter)
{
int port;
try
{
if (string.IsNullOrEmpty(parameter))
{
port = dataConnection.Listen().Port;
}
else
{
var protocal = int.Parse(parameter);
port = dataConnection.ExtendedListen(protocal);
}
}
catch (FormatException)
{
await ReplyAsync(FtpReplyCode.SyntaxErrorInParametersOrArguments, "Protocal ID incorrect.");
return;
}
catch (NotSupportedException)
{
var supportedProtocalString =
string.Join(",", dataConnection.SupportedPassiveProtocal.Select(x => x.ToString()));
await ReplyAsync(FtpReplyCode.NotSupportedProtocal, $"Protocal not supported, use({supportedProtocalString})");
return;
}
dataConnectionMode = DataConnectionMode.ExtendedPassive;
await ReplyAsync(
FtpReplyCode.EnteringEpsvMode,
string.Format("Entering extended passive mode (|||{0}|).", port));
}