[DGD] Re: PASV mode and ports for ftp server

[Wim van der Vegt]

Hi,

It's for the client to say if they want pasv or normal mode, it's for the
server to implement one or both.

When i wrote my ftpd i implemented both (the client must issue a pasv
command to enter pasv mode, so it's possible to switch during a ftp
session). Because of strange problems in timing i had to remove pasv mode
(ie outcomment it).

-----------
Wim van der Vegt

-----Original Message-----
From: Tim Blommerde <T.Blommerde at et.tudelft.nl>
To: dgd at list.imaginary.com <dgd at list.imaginary.com>
Date: zaterdag 12 september 1998 12:58
Subject: [DGD] Re: PASV mode and ports for ftp server


>Greetings Wim and all interested readers,
>
>
>>Hi,
>>
>>I guess you still have to read the rfc more carefully. Ftp has one port it
>>listens to for commands and which can accept as much connections as your
>>computer can supply. The other connection's port number depends on wether
>>you use PASV mode or normal mode. In normal mode the client supports a
port
>>number the server connects to. In PASV mode it's the other way round and
>the
>>server starts listening to a port for incoming data connections.
>
>
>Well, I guess I stated my questions a bit wrong.  I knew this (Tim likes
his
>Internet Protocols handbook), but default the data connection is
established
>on data port 20.  And indeed the PORT and PASV commands are used to change
>from this default.  What I wanted to know if people would rather like
>another default, namely indeed the passive mode, or even if people are
>really short on ports, if they would like to see the ftp server handle
>requests on the same port as the port they use to login.  I'm not 100% sure
>if the latter would be possible, without hacking the system too much and
>paying with performance loss and security problems, but if people would
like
>that, I'd give it a try.
>
>>-----------
>>Wim van der Vegt
>>
>>Btw i'll e-mail you my ftp server so you can have a look at it. It
supports
>>most commands and already contains all the response messages and code to
>>handle the possible returns codes etc. It will save you a lot of typing i
>>guess.
>>
>
>That would be greatly appreciated.  I'm looking forward to it.  If there's
>anything missing or you'd like to have additions to it and don't feel like
>writing them yourself atm, I'd be really honoured to help out.  I've kept
>this weekend free to try and do something for the dgd community and a good
>ftp server was the goal.  If I, in anyway, can do something else for dgd,
>please, do ask and I'll see what I can do (shutting up and stop spamming
the
>dgd mailing list is ofcourse one of the options *blush*).  Though I fear
I'm
>not an experienced dgd coder, I am familiar with LPC and hope to increase
my
>dgd coding capabilities to a reasonable level.
>
>Thanks for the quick reply and hope to hear from you soon,
>Tim
>
>
>
>
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>




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