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DISCUSSION Dipak Biswas 4 participants 4 messages Jul 20, 2001 – Jul 21, 2001

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Dipak Biswas

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#0 lore raw

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

#1 lore raw
Quoted 11 lines · 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

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.

#2 lore raw
In reply to Dipak Biswas
Quoted 7 lines · 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?

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

Quoted 2 lines

Thanks,
dipak

/Matti Aarnio

#3 lore raw
In reply to Dipak Biswas
Quoted 27 lines · Richard B. Johnson
Quoted 11 lines · 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

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.

Quoted 5 lines

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I would suggest using IPTables, personally, that's what I use for all of my firewall-type needs.

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-Aaron

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