How to query Kernel how it would route packets?

Hi, together,

I am currently developing a Signaling Protocol instance, which will
signal along a IP "Flow".

Thus I have addressing information the like

"Flow Source IP"/"Flow Destination IP"

Now I want to query the Linux kernel, how it woul route Pakets with that
source and destination. (This is essential to me, as I must not use
other interfaces than these, which are used for the flow, and a router
would have many of them *ggg*)

I found that the program "ip" is able to do such queries
("ip route get 10.10.0.1 from 10.10.0.6"),
but I found still no way to query the kernel programmatically from a C++
program.

Has anyone some hints to as where to look for information or even a
solution?

"man 7 ip" and referenced manpages did not help thus far...

Many thanks,
Thomas

On Fri, 14 Oct 2005 18:43:46 +0200, Thomas Herzog
<(E-Mail Removed)> wrote:

>Hi, together,
>
>I am currently developing a Signaling Protocol instance, which will
>signal along a IP "Flow".
>
>Thus I have addressing information the like
>
>"Flow Source IP"/"Flow Destination IP"
>
>Now I want to query the Linux kernel, how it woul route Pakets with that
>source and destination. (This is essential to me, as I must not use
>other interfaces than these, which are used for the flow, and a router
>would have many of them *ggg*)
>
>I found that the program "ip" is able to do such queries
>("ip route get 10.10.0.1 from 10.10.0.6"),
>but I found still no way to query the kernel programmatically from a C++
> program.
>
>Has anyone some hints to as where to look for information or even a
>solution?
>
>"man 7 ip" and referenced manpages did not help thus far...
>
>Many thanks,
>Thomas

I haven't looked at it, but perhaps this will help?
http://www.coverfire.com/lql/

--
buck

Thomas Herzog wrote:

> Hi, together,
>
> I am currently developing a Signaling Protocol instance, which will
> signal along a IP "Flow".
>
> Thus I have addressing information the like
>
> "Flow Source IP"/"Flow Destination IP"
>
> Now I want to query the Linux kernel, how it woul route Pakets with that
> source and destination. (This is essential to me, as I must not use
> other interfaces than these, which are used for the flow, and a router
> would have many of them *ggg*)
>
> I found that the program "ip" is able to do such queries
> ("ip route get 10.10.0.1 from 10.10.0.6"),
> but I found still no way to query the kernel programmatically from a C++
> program.
>
> Has anyone some hints to as where to look for information or even a
> solution?
>
> "man 7 ip" and referenced manpages did not help thus far...
>
> Many thanks,
> Thomas
Use the Source Luke. The source of ip that is.

David
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David Goodenough wrote:

> Use the Source Luke. The source of ip that is.
>
> David

Thanks for the hint ;-)

I hoped not to have to do it, as core utilities in Linux tend to be
developed by the ultimate hackers and the chance for "normal people" to
understand these is somewhat limited *ggg*

But I will have a look at it, as it seems there is no other way :-)

(E-Mail Removed) wrote:

>
> David Goodenough wrote:
>
>> Use the Source Luke. The source of ip that is.
>>
>> David
>
> Thanks for the hint ;-)
>
> I hoped not to have to do it, as core utilities in Linux tend to be
> developed by the ultimate hackers and the chance for "normal people" to
> understand these is somewhat limited *ggg*
>
> But I will have a look at it, as it seems there is no other way :-)
Well you can always look in the source and find the author, or at least
the last person who messed with it, and try asking them.

David
_________________________________________
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