Please suggest me

Please suggest me

[Dipak Biswas]

Hi All,
    I'm quite new to linux world. I've a very awkard question for you.
That is: I'm writting an user process, where I need all outgoing
IP packets to be blocked and captured. First, is it really possible? If
yes, how? I don't want to make any kernel source code changes. A wild
guess: by configuration changes, is it possible to make IP process write
on to a particular FD which I can read when I require?

Thanks,
dipak

Re: Please suggest me

[Richard B. Johnson]

On Fri, 20 Jul 2001, Dipak Biswas wrote:

> Hi All,
>     I'm quite new to linux world. I've a very awkard question for you.
> That is: I'm writting an user process, where I need all outgoing
> IP packets to be blocked and captured. First, is it really possible? If
> yes, how? I don't want to make any kernel source code changes. A wild
> guess: by configuration changes, is it possible to make IP process write
> on to a particular FD which I can read when I require?
> 
> Thanks,
> dipak
> 

Get the source-code of `tcpdump` and see how packet capturing is done.
You can also look at `ipchains` to see how to block packets.

Cheers,
Dick Johnson

Penguin : Linux version 2.4.1 on an i686 machine (799.53 BogoMips).

    I was going to compile a list of innovations that could be
    attributed to Microsoft. Once I realized that Ctrl-Alt-Del
    was handled in the BIOS, I found that there aren't any.

Re: Please suggest me

[Matti Aarnio]

On Fri, Jul 20, 2001 at 02:13:00PM -0400, Dipak Biswas wrote:
> Hi All,
>     I'm quite new to linux world. I've a very awkard question for you.
> That is: I'm writting an user process, where I need all outgoing
> IP packets to be blocked and captured. First, is it really possible? If
> yes, how? I don't want to make any kernel source code changes. A wild
> guess: by configuration changes, is it possible to make IP process write
> on to a particular FD which I can read when I require?

	Look at how tools like  tcpdump  and  etherreal  do it.
	It has been done over and over again -- in userspace tool.

> Thanks,
> dipak

/Matti Aarnio

Re: Please suggest me

[Aaron Smith]

On Fri, Jul 20, 2001 at 03:18:44PM -0400, Richard B. Johnson wrote:
> On Fri, 20 Jul 2001, Dipak Biswas wrote:
> 
> > Hi All,
> >     I'm quite new to linux world. I've a very awkard question for you.
> > That is: I'm writting an user process, where I need all outgoing
> > IP packets to be blocked and captured. First, is it really possible? If
> > yes, how? I don't want to make any kernel source code changes. A wild
> > guess: by configuration changes, is it possible to make IP process write
> > on to a particular FD which I can read when I require?
> > 
> > Thanks,
> > dipak
> > 
> 
> Get the source-code of `tcpdump` and see how packet capturing is done.
> You can also look at `ipchains` to see how to block packets.
> 
> Cheers,
> Dick Johnson
> 
> Penguin : Linux version 2.4.1 on an i686 machine (799.53 BogoMips).
> 
>     I was going to compile a list of innovations that could be
>     attributed to Microsoft. Once I realized that Ctrl-Alt-Del
>     was handled in the BIOS, I found that there aren't any.
> 
> 
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I would suggest using IPTables, personally, that's what I use for all of my firewall-type needs.

-- 
-Aaron

Don't hate yourself in the morning, sleep till noon