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List:       xchat-discuss
Subject:    Re: malformed DCC request
From:       Ian <freebsd () damnhippie ! dyndns ! org>
Date:       2002-05-31 17:05:07
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On 05/31/02 04:39, Richard Fuchs wrote:

> On Tue, May 28, 2002 at 06:09:26PM -0600, Ian wrote:
>> On 05/28/02 12:34, Dennis Bjorklund wrote:
>> 
>>> I got this error message:
>>> 
>>> --- Received a malformed DCC request from xxxxx.
>>> --- Contents of packet: "DCC CHAT chat 12341234 0 4223".
>>> 
>>> [snip]
>> 
>> That is a malformed DCC request.  It has a port number of zero and a "file
>> size" of 4223 which is meaningless for a chat connection (typically a zero
>> is used as a placeholder for filesize in chat requests).  I'm guessing the
>> client that sent that request reversed the last two numbers and 4223 was
>> supposed to be the port number.
> 
> This is yet another mIRC extension to the DCC protocol. I think it's called
> DCC proxy or something. It's meant to allow DCC requests to be made from
> behind a firewall. It's not supported by Xchat, nor by most other client, I
> guess. I saw a document describing this protocol somewhere; maybe look on
> mirc.com for info.
> 
> Richard
> --

What makes this an "extension", the fact that the port number is zero and
that's always illegal?  Other than having a zero for the port number this
appears to be a standard valid DCC chat request.

-- Ian

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