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.NET Forum / Languages / C# / March 2008

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Talking to an FTP server  --- please help!

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almurph@altavista.com - 11 Mar 2008 15:33 GMT
Hi everyone,

    Can you help me please? I am trying to login into to an FTP server. I
can successfully reach the server and it sends me a welcome message
but after that I don't know how to send down the username, password
etc...It identifies itself as: "Pure-FTPd"

    Is there any way I can find out this by asking the server in some way
as to the format that it accepts? Do you know what I mean? Any
suggestions/comments/useful code samples/advice would be most
appreciated.

Thanks in advance,
Al

**** CODE AS FOLLOWS ****

System.Net.Sockets.TcpClient mtTCPClient = new
System.Net.Sockets.TcpClient(FTPUrl, portNo);
System.Net.Sockets.NetworkStream  myNS = mtTCPClient.GetStream();

//2. Read something
if (myNS.CanRead )
{
    byte[] myReadBuffer = new byte[1024];
    String myCompleteMessage = "";
    int numberOfBytesRead = 0;
    // Incoming message may be larger than the buffer size.
    do
    {
        numberOfBytesRead = myNS.Read(myReadBuffer, 0,
myReadBuffer.Length);
        myCompleteMessage = String.Concat(myCompleteMessage,
System.Text.Encoding.ASCII.GetString(myReadBuffer, 0,
numberOfBytesRead));
    }
    while(myNS.DataAvailable);
}

**** END CODE ****
Peter Morris - 11 Mar 2008 15:47 GMT
It's a protocol, so it should be the same for all servers.  If you need it
to be easier try some FTP components, rebex for example.
Jon Skeet [C# MVP] - 11 Mar 2008 15:54 GMT
>     Can you help me please? I am trying to login into to an FTP server. I
> can successfully reach the server and it sends me a welcome message
[quoted text clipped - 5 lines]
> suggestions/comments/useful code samples/advice would be most
> appreciated.

You look at the RFC for FTP:

http://www.faqs.org/rfcs/rfc959.html

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Jon Skeet - <skeet@pobox.com>
http://www.pobox.com/~skeet   Blog: http://www.msmvps.com/jon.skeet
World class .NET training in the UK: http://iterativetraining.co.uk

Arne Vajhøj - 12 Mar 2008 02:41 GMT
>     Can you help me please? I am trying to login into to an FTP server. I
> can successfully reach the server and it sends me a welcome message
[quoted text clipped - 5 lines]
> suggestions/comments/useful code samples/advice would be most
> appreciated.

First: are you sure that you can not use the builtin classes
in .NET since version 2.0: FtpWebRequest/Response ?

Secondly: the FTP protocol is a bit tricky (at least more
than HTTP, SMTP etc.). You can start studying the FTP RFC.
I also have some code I created for .NET 1.1 to have FTP and
still use on newer .NET versions if the builtin does not
work as I want it. IF you are interested I can post a link.

Arne
Cuong - 12 Mar 2008 17:19 GMT
> >     Can you help me please? I am trying to login into to an FTP server. I
> > can successfully reach the server and it sends me a welcome message
[quoted text clipped - 16 lines]
>
> Arne

Could you post the link? I would like to take a look....
Thanks!
Arne Vajhøj - 13 Mar 2008 03:08 GMT
>> Secondly: the FTP protocol is a bit tricky (at least more
>> than HTTP, SMTP etc.). You can start studying the FTP RFC.
[quoted text clipped - 3 lines]
>
> Could you post the link? I would like to take a look....

http://www.vajhoej.dk/arne/eksperten/div_2007_04/xftp.cs

Arne
Cuong - 13 Mar 2008 16:11 GMT
> >> Secondly: the FTP protocol is a bit tricky (at least more
> >> than HTTP, SMTP etc.). You can start studying the FTP RFC.
[quoted text clipped - 7 lines]
>
> Arne

Thank you!

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