[gentoo-user] About a proxy-like idea... (was Shell through the web)

["Steve [Gentoo]" <gentoo_steve@shic.co.uk>]

Dave Nebinger wrote:
> On Tuesday 11 October 2005 07:37 am, Steve [Gentoo] wrote:
>   
>> I'm also vaguely hopeful that there may
>> be a more efficient lower-level solution which wouldn't require the
>> overhead of a process to 'pass-on' the tcp data... maybe integrated with
>> ipchains or pf or similar?
>>     
> If you choose to roll your own solution, that would be difficult.  Youve 
> already accepted the connection, so the firewall is now configured to allow 
> the packets back and forth only when related to your connection.
>   
I realise that the idea would necessarily be substantially more 
challenging than just writing a proxy... but I'm sure it is possible.  
I'm guessing I'd need to interact at the IP packet level, recognise the 
start of a TCP stream (buffering packets as necessary) then re-play them 
to the right port and force the packet filter to re-direct that TCP 
stream.  It would not be worth my time to try and make this work if it 
isn't already available for me to just compile and use.
> Technically the proxy development is not difficult, but for newbies it can be 
> frustrating working out the nuances of processing asynchronous data arriving 
> on one pipe let alone two.
>   
I'm confident that I could write a proxy that would do this... as you 
suggest - it's not rocket science.  Conversely, I'm lazy enough to just 
use one that's already written if one exists... which, I'm guessing, is 
likely as I doubt I'm the first person to tackle this.

Steve

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