Implement custom network protocol for local processes

Implement custom network protocol for local processes

[Kfir Lavi]

Hi,
How can one implement custom header network protocol.
I mean header that wraps regular network packets like ethernet, udp, tcp,
etc...
The sending of this custom packets is done between processes running
locally.
ie. I get a Ethernet packet, inspect it, then add my custom header and
forward
it to another process that listens to a socket, and expect to get data
wrapped with
this custom header.

What is a good way to go about and implement this thing?

Thanks,
Kfir
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Implement custom network protocol for local processes

[John Mahoney]

On Mon, Jan 17, 2011 at 4:24 PM, Kfir Lavi <lavi.kfir@gmail.com> wrote:
> Hi,
> How can one implement custom header network protocol.
> I mean header that wraps regular network packets like ethernet, udp, tcp,
> etc...
> The sending of this custom packets is done between processes running
> locally.
> ie. I get a Ethernet packet, inspect it, then add my custom header and
> forward
> it to another process that listens to a socket, and expect to get data
> wrapped with
> this custom header.
>
> What is a good way to go about and implement this thing?

Have you looked at the tun/tap drivers?

Also, try asking this question on a network specific list.

--
John

Implement custom network protocol for local processes

[Kfir Lavi]

On Mon, Jan 17, 2011 at 11:43 PM, John Mahoney <jmahoney@waav.com> wrote:

> On Mon, Jan 17, 2011 at 4:24 PM, Kfir Lavi <lavi.kfir@gmail.com> wrote:
> > Hi,
> > How can one implement custom header network protocol.
> > I mean header that wraps regular network packets like ethernet, udp, tcp,
> > etc...
> > The sending of this custom packets is done between processes running
> > locally.
> > ie. I get a Ethernet packet, inspect it, then add my custom header and
> > forward
> > it to another process that listens to a socket, and expect to get data
> > wrapped with
> > this custom header.
> >
> > What is a good way to go about and implement this thing?
>
> Have you looked at the tun/tap drivers?
>
> Yes I did, they can work for me, but I need to modify the code.
They expect  certain protocols and are not passing anything.
It is a bit ugly to go this way.

Also, try asking this question on a network specific list.
>
> --
> John
>
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Implement custom network protocol for local processes

[Vasiliy Kulikov]

Kfir,

On Mon, Jan 17, 2011 at 23:24 +0200, Kfir Lavi wrote:
> Hi,
> How can one implement custom header network protocol.
> I mean header that wraps regular network packets like ethernet, udp, tcp,
> etc...
> The sending of this custom packets is done between processes running
> locally.
> ie. I get a Ethernet packet, inspect it, then add my custom header and
> forward
> it to another process that listens to a socket, and expect to get data
> wrapped with
> this custom header.

You might want to use datagram-oriented UNIX socket to communicate with
client processes.

Also you have to understand what do you want - getting UDP packets on
specific port doesn't require anything special, just bind()'ing to this
port.  But you can get TCP segments only with SOCK_RAW socket.


Thanks,

-- 
Vasiliy